One manifold is hotter than the other... |
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behindpropeller
Platinum Member Joined: July-31-2006 Status: Offline Points: 1810 |
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Posted: June-01-2007 at 3:54pm |
On my 86 2001 I have noticed that one exhaust manifold is always hotter than the other one. Is this a sign that my circulation pump needs to be replaced?
I can hold my hand on one side, and the other side is too hot to hold my hand on. I checked the hose coming out of the thermostat housing and there is no blockage there. Tim |
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nuttyskier2002
Gold Member Joined: September-28-2005 Location: United States Status: Offline Points: 669 |
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Tim, the circulation pump has nothing to do with directing the water to one manifold or the other. The water flow will follow the path of the least resistance. Under normal conditions resistance should be equal on both sides. Remove the hose from the side that is overheating and let it run into a bucket. Run the the engine and check flow. If flow is good you have blockage in the manifold.
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95 Malibu Echelon w/Mercruiser 350 Magnum Skier
Former boats: 88 Ski Centurion Tru Trac II 59 Chris Craft Capri (woody) |
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Hollywood
Moderator Group Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13513 |
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When you winterize do you remove the rear drain plugs or just run A/F through the block from a bucket?
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M3Fan
Grand Poobah Joined: October-22-2005 Location: United States Status: Offline Points: 3185 |
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I believe, and have heard, that this is normal to some extent.
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2000 SN GT40 w/99 Graphics/Gel
2016 SN 200 OB 5.3L DI https://forum.fifteenoff.com |
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behindpropeller
Platinum Member Joined: July-31-2006 Status: Offline Points: 1810 |
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Hollywood-
I pull the plugs every year and run it to clean out the manifold. Once it is clean I run the anti freeze through it using the engine pump. Nutty- I did do exactly what you said, thought I had said that in my post. Tim |
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JR_VIC
Senior Member Joined: June-05-2006 Location: United States Status: Offline Points: 175 |
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I had the same issue on my 92 SNCB with a 351W. After I changed to Hi Teks I noticed that the starboard side is almost 40 degrees warmer than the port side. I called Ski DIM and they confirmed directly from PCM that the Starboard side will run hotter than the port side but I got no answer as to exactly how much hotter it will run. They backed this up because if you add the OJ Dripless shaft seal PCM and OJ recommend pulling water off to run to the shaft seal off the port side of the engine because there is more water flowing to that side than the starboard side. Again, I don't know how temp variation is acceptable but this information may help in knowing that some difference is normal.
Thanks! |
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"That's not a Snow Cone that's my Ring!"
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Jake
Groupie Joined: February-24-2004 Location: United States Status: Offline Points: 44 |
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I've had that problem when I Sh#@ an impeller. The little rubber pieces get stuck in the smaller hoses and block the water going into the manifold resulting in one a little warmer than the other.
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eric lavine
Grand Poobah Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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Jake, you ever hear of KC marine up there in Washington? the guys name is Kirk, his shop is in Bellingham
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"the things you own will start to own you"
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Tim D
Grand Poobah Joined: August-23-2004 Location: United States Status: Offline Points: 2641 |
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Look at your plumbing of the raw water pump on how it supplies constant flow to cool the exhaust. Is the connection closer to one side? When the thermostat opens, the hot water is going to be pushed to one side more than the other.
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Tim D
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9360SAN
Newbie Joined: August-31-2006 Location: Hong Kong Status: Offline Points: 23 |
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My 01SAN has the same problem,I changed the circular pump,raw water pump,a pair manifold and riser,the T-state,all new hose,new oil cooler,cleaned the water passage of the v-drive, cleaned the heat exchanger,the problem still exist! If I connect garden hose to instead the raw water pump,both manifold become cool, so my conclusion is the flow volume of the raw water pump not enough.
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Go on wakeboard
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woodyelc
Senior Member Joined: February-17-2004 Location: orlando Status: Offline Points: 378 |
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DID ANYBODY CHANGE THE RISER GASKETS? IF THE GASKETS WERE PUT IN BACKWARDS THEY COULD CAUSE THE SAME PROBLEM.
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woodyelc
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behindpropeller
Platinum Member Joined: July-31-2006 Status: Offline Points: 1810 |
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Nothing has been changed all original. Ill check on a few friends and see what they are like.
TIm |
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melty_1
Newbie Joined: April-04-2007 Status: Offline Points: 3 |
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JR_VIC -
I have the exact opposite on my PCM 351. Less water and hotter riser on portside. (my raw water pump is on starboard) Are you sure your info is correct? (Not suggesting it's wrong...just researching some similar problems I'm having). Thanks, Sheri |
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eric lavine
Grand Poobah Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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this again would be a great spot for a digital laser thermometer, if the heat is being created by wrong gaskets it will be much hotter in that spot. you can finf them for around 50 bucks nowadays, i paid 119 bucks 3 years ago. I have used it a thousand times. It helps me isolate many problems such as taking temps on the exhaust manifolds at the ports, if there's a problem that cylinder will run much cooler
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"the things you own will start to own you"
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Randy_in_Ohio
Platinum Member Joined: September-13-2006 Location: N. Canton, OH. Status: Offline Points: 1891 |
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I pulled this old thread up tonight while searching for ideas on why my starboard side manifold has been running hot after a certain marine mechanic and inboard transmission specialist from Brunstucky replaced my manifolds which both had cracks in them, installed an OJ dripless seal, and rebuilt my trannny which was leaking pretty badly and was making clunking noises when put into gear. While the transmission is now smooth as silk, the starboard manifold is getting really hot. So, I called this Brunstuckian, (who also stole one of my favorite shirts while in Green Lake, WI.) and asked him why the #$%& this was happening after he replaced the manifolds. He was puzzled as much as I was. I just took the RWP off and cleaned all the surfaces and put a new impeller, and gasket in even though the impeller was less than a year old and looked fine. I didn't see any air running through the strainer and I took the strainer apart to make sure it was clean. So I was searching CCF tonight trying to find some clue to what is causing this and I came across this old thread. This part of JR VIC's post made the light bulb in my head go on. "because if you add the OJ Dripless shaft seal PCM and OJ recommend pulling water to run to the shaft seal off the port side of the engine because there is more water flowing to that side than the starboard side." Should the hose for the dripless seal tap into the hose that runs from the thermostat housing to the port side manifold instead of right after the RWP where the Brustuckian mechanic installed it? I am going to go to Home Depot in the morning and pick up a 1" plastic coupler to attach the hoses together where the "T" for the OJ seal is now and try moving the water supply for the OJ seal to the hose before the port side manifold. This makes sense since the port side manifold seems to have plenty of water flow. This is only temporary, if this fixes the water flow I will replace the hoses. I hope I have figured this out. |
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eric lavine
Grand Poobah Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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with the perko hooked up and a pressurized hose will the pump sound like it cavitates? i listened on the phone as Randy ran the boat and it sounded like the pump was jerking, up at GL also the top right hose going to the port manifold was also pulsating. above sounds logical, we did pull the hose to the starboard and it seemed like it did have plenty of flow....pretty baffled, but Ive always plummed them on the hose after the RWP,. when i open a package the first thing to go in the garbage are the directions...good day to learn something...the hoses are whats baffling me on why the are pulsating because we cant see any air in the clear line from the dripless
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"the things you own will start to own you"
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Randy_in_Ohio
Platinum Member Joined: September-13-2006 Location: N. Canton, OH. Status: Offline Points: 1891 |
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I moved the clear hose to the dripless seal from after the RWP to before the port side manifold and it didn't seem to make much of a difference. The starboard side is still a lot hotter than the port side. I didn't run it hard for very long since the weather started to turn bad, but I could keep my hand on the port side comfortably but the starboard side got hot enough to where I could still touch it but wouldn't want to leave my hand on it for very long.
The sound that Eric mentioned above went away after I loosened the belt on the RWP. I think the belt was too tight and that was what was causing the sound we heard. I have no idea what is causing this. Hey Tim, what did you do to fix this problem two years ago??? |
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eric lavine
Grand Poobah Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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I wonder if a restricted fitting to the port side would create more flow to the starboard? this may even things out a bit, we could use some temp readings, when a transmission hits 150 degrees i can hold my hand on it for about 5 seconds, at 180 degrees about 2 seconds. i use a digital thermometer for accuarte readings. Is there anyone with these common temps? we have gathered that the Starboard generally runs hotter than the port, but how hot is hot?
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"the things you own will start to own you"
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Randy_in_Ohio
Platinum Member Joined: September-13-2006 Location: N. Canton, OH. Status: Offline Points: 1891 |
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Harbor freight has a laser thermometer for $26.99. I could pick one up.
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behindpropeller
Platinum Member Joined: July-31-2006 Status: Offline Points: 1810 |
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I never could find the reason...for all I know it has been like that since it left the factory. FYI... My dripless packing water lube comes out of the "J" just below the waterpump. Tim |
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Randy_in_Ohio
Platinum Member Joined: September-13-2006 Location: N. Canton, OH. Status: Offline Points: 1891 |
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I think I may try removing the Perko flush unit and see if that may be restricting the water flow.
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eric lavine
Grand Poobah Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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just for the hell of it randy, try to find a way to restrict the hose going to the port manifold, maybe wrap it with electrical tape and squeeze it partially with vice grips but not closing it, while doing this take some temp readings. the water has to go somewhere and as said earlier it will follow its easiest path, but by restricting the port hose it will increase the volume of water to the starboard side, hopefully
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"the things you own will start to own you"
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eric lavine
Grand Poobah Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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Randy, another thought, there really is not any guidelines on manifolds, old manifolds do get restricted and the water sticks around longer to transfer heat, on fresh clean manifolds the water is barely restricted and flys through these manifolds unabling them to transfer heat. temp readings will help to determine what is correct and what isnt, they are exhaust manifolds and typically are the hottest part of the engine, they are cast iron and the same as on cars and cars will see 700 degree temps. are we chasing our tail here?
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"the things you own will start to own you"
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Randy_in_Ohio
Platinum Member Joined: September-13-2006 Location: N. Canton, OH. Status: Offline Points: 1891 |
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Maybe. This could be normal. I have been accused of being a little over worried about things from time to time. But they are getting hot enough to make a burning smell after they get heated up. I just don't want to cause any damage. I will remove the Perko flush and get a thermometer and see where we are at. work back from there and install the Perko again see if it makes a difference. If the weather holds up I'll take it to the lake and run around and get some temp readings. |
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Randy_in_Ohio
Platinum Member Joined: September-13-2006 Location: N. Canton, OH. Status: Offline Points: 1891 |
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I wasn't able to get a laser thermometer. I went to two different Harbor Freight stores and they were both sold out of them. Must be a good deal, I got a raincheck and they said they would call me when they come in.
I took the boat out last night but got out a little late to really run it hard. Your only aloud to run fast until 8pm. I took a couple laps and it seems the same with the Perko flush removed. I could leave my hand on the port side manifold all day but the starboard side I wouldn't want to leave my hand on for more than a few seconds. Running it at idle seems to cool the starboard side down to about the same temp as the port side after a half hour or so. I did notice a little bit of air bubbles running through the clear line to the OJ seal now that it is on the hose going to the port side manifold. No air bubbles in the strainer cup. Maybe it is pulling some air through the pump? |
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Randy_in_Ohio
Platinum Member Joined: September-13-2006 Location: N. Canton, OH. Status: Offline Points: 1891 |
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I was going to remove the muffler tonight to look at the hose from the riser to the muffler. I think this hose on the starboard side may be coming apart on the inside. It is a lot softer than the hose on the port side. My thinking is that it may be unraveling on the inside and causing a restriction of the water flow through the manifold.
Once I got started I realized that the only way to remove the muffler is to remove the risers off the manifolds. I think once I separate the risers from the manifolds I will have to replace the gaskets. Is this correct??? I already ordered the hose, but they sent me the wire reinforced hose instead of the stuff without wire like what is on there now and what I told them I wanted when I ordered it. I was hoping I may be able to score some hose locally and just send this back for a refund. But I'm not sure if I will need new riser gaskets as well to get the job done. I'm hoping to be able to get this sorted out by the weekend, It's supposed to be a beautiful weekend and I was really hoping we would be able to get out on the lake. |
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SNobsessed
Grand Poobah Joined: October-21-2007 Location: IA Status: Offline Points: 7102 |
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Randy - I assume you have the intertaflow. It took two of us, but we were able to wiggle it enough to remove the muffler w/o removing the risers. Loosen the clamps well & use a screwdriver to break the seal of the hoses to the risers.
Hope it is your hose, you must be frustrated. Maybe you should just hacksaw thru the hose, sounds like it is bad anyway. |
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Randy_in_Ohio
Platinum Member Joined: September-13-2006 Location: N. Canton, OH. Status: Offline Points: 1891 |
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I am frustrated.
I do have the Invertaflow. I may give that a try if I can find some non-wired hose locally. I don't think I want to try that with this wired hose. I was going to replace both sides while I had it apart, but maybe it will be easier to just replace the one side.? |
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behindpropeller
Platinum Member Joined: July-31-2006 Status: Offline Points: 1810 |
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Let me check the '93 sport here before you tear anything apart.
I personally do not think you have a problem. |
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lewy2001
Grand Poobah Joined: March-19-2008 Location: NSW Australia Status: Offline Points: 2234 |
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Randy do you still have that pulsing in the water hoses. I think that is a sign that there is air in the system.
It could possibly be a restriction in the invertaflow or exhaust hose on that side. When I was doing the alignment on mine last year I removed the muffler to get at the mounts easier and found that the heat from exhaust had eroded the resin at the muffler inlet and pieces of matt were restricting flow a bit. From memory at GL when Eric was investigating the problem. The hose on the riser on that side felt funky if the heat has damaged the hose it also may have caused similar probs on muffler inlet. I had a great time at GL with you guys thanks for taking Jo and I out in your boat. We were reminiscing our US trip the other day and had a big laugh about teaching the Ohio crew how to cuss in Aussie slang. I still don't think quinner knows what a poofter is |
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