Boats For Sale:
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fredaws 
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Joined: April-19-2023 Location: Az Status: Offline Points: 31 |
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 Topic: Cooling systemPosted: July-03-2023 at 2:07pm |
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I am refurbishing 1980 SN out of the boneyard…. Does anyone have a diagram or details on cooling systems from water pickup thru exhaust…. Am running cool with boat on trailer with hose feed.. immediately get hot when put in water. NEW water pump and impeller pump, new heads, cleaned all water passages, etc… think I have the plumbing connections wrong. PLEASE HELP.. thank you Fredaws
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Freddie
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wayoutthere
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Joined: February-28-2020 Location: Florida Status: Offline Points: 474 |
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Posted: July-03-2023 at 7:06pm |
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Was the engine intact when you began this project (missing any parts) ?
Can you post pictures of how the engine is plumbed from start to finish ? Can you post the actual temls you are seeing, both on the hose and in the water ? What degree thermostat did you install ? Is your in water temp at idle or underway ? |
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wayoutthere
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Posted: July-03-2023 at 7:40pm |
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From the intake into the transmission cooler.
from the transmission cooler to the sea pump. From the sea pump to the gooseneck (thermostat housing) Above but part of the thermostat housing is a 'T' fitting. From the T fitting to each exhaust manifold. The T fitting is a bypass that sends water to the exhaust manifolds as they need a constant flow of water. The water should flow thru the exhaust manifolds internally and into the exhaust risers and out of the exhaust tips. Where are you attaching your garden hose, inline after the pickup or thru the intake via something that looks like a toilet plunger ? Is your intake ball valve/sea cock open, it happens ! I'll try a couple more times to post pictures rather than typing |
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wayoutthere
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Posted: July-03-2023 at 7:46pm |
 
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KENO
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Posted: July-03-2023 at 8:03pm |
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Here's a non artist's diagram of the flow path to your engine. (assuming it's a Pleasurecraft 351 engine) It shows all the hoses on the inlet side of things. It doesn't try to show the flow from the circulating pump through the engine and back to the thermostat One of the other things it shows is the raw water pump with a little note next to it saying that the little screw head on the housing needs to be facing out (away from the engine) on your Reverse Rotation 1980 engine That's how it was from the factory. If it's facing in, it's on upside down and won't suck any water because the suction hose is hooked to the discharge port on the pump, but depending on your garden hose hookup you may be forcing water through it on the trailer and getting some cooling...............then you put it in the water and it'll pump nothing at all and overheat. Just something to check  
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wayoutthere
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Posted: July-04-2023 at 1:34pm |
   [URL=https://imgbb.com/" rel="nofollow]  [/URLHeres that screw on the sea pump keno is talking about. Keno calls it everytime |
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fredaws
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Posted: July-04-2023 at 2:00pm |
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Does trans cooler have a specific flow direction??? Cannot see any flow arrows….Keno n wayoutthere….thank you
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Freddie
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fredaws
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Posted: July-04-2023 at 2:08pm |
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Goes from Water pickup to bottom of impeller pump, out top of impeller pump to top of trans cooler, out of cooler to bottom of T junction on thermostat, out T to exhaust… therm at 140… reverse rotation. Thank u
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Freddie
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Gary S
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Posted: July-04-2023 at 9:55pm |
The weird thing about trans coolers and maybe any coolers for that matter is that the oil flow should be opposite of the water flow. I have heard of velvet drives over heating when hooked up backwards.
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fredaws
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Posted: July-04-2023 at 11:24pm |
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Wayouthere n Keno…. I bought a new engine circulating water pump…. Is there a different water pump for reverse rotation 351 Windsor?????? Thanku again for ALL the previous help????
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Freddie
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KENO
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Posted: July-05-2023 at 7:40am |
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If you bought a "marine" 351 circulating pump, the ones you get these days work equally well in either direction of rotation.
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Tim D
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Posted: July-05-2023 at 10:38am |
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Flip the raw water pump, cam screw goes toward the block.
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Tim D
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fredaws
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Posted: July-05-2023 at 10:48am |
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Tim…. A bit confused…. Outer bleed screw on impeller pump faces towards the block or away from block on reverse rotation 1980 SN 351 Windsor???? This is not was previous post have suggested. Thank you
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Freddie
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wayoutthere
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Posted: July-05-2023 at 11:46am |
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I'm just posting pictures, detailed info is gonna come from keno and other members.
My questions are just basic troubleshooting. One thing i would try, with 2 lenghts of hose and a bucket of water is see which way your sea pump pumps. No hose pressure, just a hose off the top and bottom of the pump and into a bucket of water. Start the engine, inlet and outlet should be immediately clear. Plumb it in accordingly. Pictures of the engine plumbing and the pump are needed here for sure, if anything is amiss the members onboard who know these engines back n forth in their sleep will get this sorted out. |
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fredaws
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Posted: July-05-2023 at 12:33pm |
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Got it…. Upon ignition, the distributor rotor turns counter clockwise while circulating water pump turns clockwise. I believe this shows reverse rotation…. Screw on impeller pump is facing away from block… I am changing plumbing lines to match previous diagram. And will try “bucket” tests. Thank you again … gonna get there..,.😎
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Freddie
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KENO
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Posted: July-05-2023 at 12:52pm |
Sounds to me like you don't know what you have for rotation No matter which way the engine rotates the distributor always goes counterclockwise on a 351 for reasons we don't need to get into here.. If your circulating water pump and your alternator and your raw water pump pulleys all turn clockwise if you're standing in front of the engine looking back at it, then it's a NORMAL Rotation engine. If you're in back of the engine looking forward and everything is rotating clockwise then you have a REVERSE rotation engine. I'd get that straight before figuring out which way the pump should be oriented Is this a PCM engine that looks like wayoutthere's pictures? Here's a link to lotsa reading about engine rotation |
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KENO
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Posted: July-05-2023 at 1:23pm |
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And here's a picture to help out
 I seem to remember TimD posting it lots of years ago
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fredaws
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Posted: July-06-2023 at 1:25pm |
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Keno, Tim D and wayouthere, with all this info it is determined I have a standard left hand rotation, my motor does look like the gold motor in pics but if that is a reverse rotation motor along with your flow charts “drawing” it looks like my raw water pump screw should be facing inward, on standard rotation and not outward for reverse rotation like I had it installed. The new impeller installed has been completely destroyed…. Does that have to do with pump installed backwards??? The motor had never been started without water being primed throughout cooling system prior to starting. Thank u again for all your help…. No impeller sure explains ‘ overheating’ while in water and on trailer….so raw water pump screw in or out????? Have a great day
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Freddie
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KENO
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Posted: July-06-2023 at 1:43pm |
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Standard automotive LH rotation like you have.............the screw faces in toward the engine
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fredaws
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Posted: July-06-2023 at 6:07pm |
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Thank you ALL for your help… picking up new impeller and installing with cam screw facing block… will clean out all rubber debris from cooling lines… trans cooler will need to be cleaned out, it is located between the raw water pump and circulating water pump… will do the recommended tests from there.
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Freddie
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JayG80
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Posted: July-06-2023 at 7:59pm |
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2007 Ski
2002 Ski |
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fredaws
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Posted: July-08-2023 at 8:24pm |
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👍👍👍
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Freddie
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KENO
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Posted: July-09-2023 at 6:20am |
So this must mean it runs at the right temperature while you're driving it around in the water ? |
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fredaws wrote: