Leaking Cylinder |
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jerry.nichols@m
Newbie Joined: November-05-2007 Location: United States Status: Offline Points: 10 |
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Posted: November-30-2017 at 10:47am |
Does this sound right? I took my '07 211, 5.7, 330hp (550 hours) in to be winterized and I asked them to look at the engine which was idling a little bit rough. Engine smoothed out at 100rpm and higher. I was thinking bad gas, or gas filter. Boat shop said number 7 cylinder had 90% leakage. Need to pull motor and send to machine shop. Looking at $4-5k to fix. Boat has been maintained regularly. Oil change about every 50 hours. Boat has never given me an ounce of problems before. Two questions, does this sound right and should it be good as new when finished?
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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If it were me I would have asked them where that 90% is going- exhaust, intake or crankcase. Might be wise to get a second opinion don't you think ?
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 11046 |
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I guess from this you can assume they did a leakdown test on the engine.
90% leakage would mean you're driving around in a v7 with one dead cylinder just going along for the ride. How's it run otherwise, like when it smooths out above 1000 rpm all the way up to full throttle. I'd ask the shop for more detail and like Gary said, get a second opinion from someplace else |
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jerry.nichols@m
Newbie Joined: November-05-2007 Location: United States Status: Offline Points: 10 |
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Typo in my original post: engine runs smooth from 1000rpm and higher.
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Duane in Indy
Platinum Member Joined: October-26-2015 Location: Indiana Status: Offline Points: 1578 |
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Not enough info
Like said above "where is it leaking?" Second opinion for sure, and be there when they leak it. May just need an upper end fix. |
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Keep it as original as YOU want it
1978 Mustang (modified) |
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baitkiller
Platinum Member Joined: October-11-2011 Location: SW Florida Status: Offline Points: 1693 |
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90% is catastrophic. If 90% is true than the chances are overwhelming that work will be needed to both top and bottom. Further testing is a waste of time. Its toast.
Me? I would tear it down and fix it myself. but you aren't me. MMotors has a screaming deal on a NEW, not rebuilt long block/ $2900 Just drop this off at the shop and tell them to change it. http://www.michiganmotorz.com/350ci-vortec-base-marine-engine-1996-current-replacement-p-109.html You are also (likely) going to need exhaust manifolds and risers. #7 tells me it was water in the manifold entering through the exhaust valve. 7 is is the furthest downhill in a ski boat. |
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Jesus was a bare-footer.............
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Duane in Indy
Platinum Member Joined: October-26-2015 Location: Indiana Status: Offline Points: 1578 |
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Really Guess that rules out: carbon under exhaust valve, burnt valve stuck valve, ect Stand by my "second opinion autopsy" idea before pulling an engine and disassembling cause so and so's mechanic said "90%" You could get lucky here, but not always Removing and replacing is my last option JMO |
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Keep it as original as YOU want it
1978 Mustang (modified) |
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baitkiller
Platinum Member Joined: October-11-2011 Location: SW Florida Status: Offline Points: 1693 |
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Let me clear that up a little. The heads coming off anyway and then you'll know for sure.
You know the heads coming off so why go chasing after silly crap? It is now time to strip and inspect not spend $110 an hour for some AMI graduate mouth breather at the dealership to make his best guess. Better? |
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Jesus was a bare-footer.............
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baitkiller
Platinum Member Joined: October-11-2011 Location: SW Florida Status: Offline Points: 1693 |
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(I said if that 90% is true)
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Jesus was a bare-footer.............
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rolleronariver
Senior Member Joined: May-24-2016 Location: Rogers, AR Status: Offline Points: 195 |
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I wouldn't assume that it's toast yet. Like several guys said, find out where it is leaking from, a dropped valve could cause 90% leakage too. I do think you would hear some noise though if the valve was that messed up. I also think you would notice a power drop even above 1,000rpm. Just my $.02. I'm not a master mechanic but I do like working on things and I've seen valve and head issues cause things like this. I also agree that the number 7 cylinder could be water damage since 7 and 8 or the two lowest cylinders.
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92 Sport nautique
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Duane in Indy
Platinum Member Joined: October-26-2015 Location: Indiana Status: Offline Points: 1578 |
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Yep. |
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Keep it as original as YOU want it
1978 Mustang (modified) |
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phatsat67
Grand Poobah Joined: March-13-2006 Location: Indiana Status: Offline Points: 6150 |
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I 100% never trust anyone who says the first option is IT'S JUNK BUILD NEW MOTOR.
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MrMcD
Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3734 |
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Pull the number 7 spark plug and examine it. Post pictures here we can help.
Do a compression check on this cylinder and see what you have. A leak down will tell you more but if you have 160+ compression the problem is elsewhere. Vortex engines have high compression. |
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63 Skier
Grand Poobah Joined: October-06-2006 Location: Concord, NH Status: Offline Points: 4269 |
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Jerry, some great advice above. What is your winter storage plan? I ask because if you have the dealer winterize it, then store it yourself, it would allow you to get it to someone for a compression test or do it yourself. Like others I think it's worth taking some time or some money to look further into the problem. Pulling the engine and rebuilding will solve the problem for 4-5 thousand at the dealer, whether there was a terminal problem or not!
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'63 American Skier - '98 Sport Nautique
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SNobsessed
Grand Poobah Joined: October-21-2007 Location: IA Status: Offline Points: 7102 |
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It could possibly be they meant that cyl was at 90% (10% leakage) which would be a bit more believable on such a new engine.
If so, it's not going to leave you stranded anytime soon. |
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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63 Skier
Grand Poobah Joined: October-06-2006 Location: Concord, NH Status: Offline Points: 4269 |
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Can't imagine they would be quoting a removal and rebuild if #7 was 10% down in compression. |
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'63 American Skier - '98 Sport Nautique
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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Would an engine with mechanical damage and serious loss of compression smooth out over 1,000 rpms?? Does it smooth out over 1,000 in neutral, under a load, or both?
I'd definitely be ruling out simple ignition problems like cap, rotor etc. before pulling the block. |
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63 Skier
Grand Poobah Joined: October-06-2006 Location: Concord, NH Status: Offline Points: 4269 |
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In my experience 7 cylinder engines can be remarkably smooth, I've even been fooled on a V-Twin tractor engine for a short time not realizing was running on one cylinder. RPMs mask a lot of things. I believe Joe might have experience with running a 7 cylinder engine as well.
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'63 American Skier - '98 Sport Nautique
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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I hope Jerry comes back with more information.
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jerry.nichols@m
Newbie Joined: November-05-2007 Location: United States Status: Offline Points: 10 |
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Thank you all for helping me with my issue. I am going to the boat shop this Saturday (its about 200 miles away) with questions I've collected from you all from this forum.
I will return and post my finds. Please stay tuned and thank you all again for helping me. |
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baitkiller
Platinum Member Joined: October-11-2011 Location: SW Florida Status: Offline Points: 1693 |
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Thank you Jerry for not whisping away into the vapor.
We are genuinely interested so please do come back and enlighten us with your findings. John |
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Jesus was a bare-footer.............
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jbear
Grand Poobah Joined: January-21-2005 Location: Lake Wales FL. Status: Offline Points: 8193 |
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+1.... john |
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"Loud pipes save lives"
AdamT sez "I'm Canadian and a beaver lover myself"... |
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Hollywood
Moderator Group Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13513 |
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Solid advice there jbear. Knew you'd be along shorty, can't pass up an engine repair thread...
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sport1999
Senior Member Joined: May-10-2015 Location: Florida Status: Offline Points: 313 |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Jerry, I too want to thank you for not forgetting about us. We all have seen some come on with a problem, we try to help offering advice and then hear nothing back. It's disappointing since I and I'm sure others would like to hear if we were able to help. |
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jbear
Grand Poobah Joined: January-21-2005 Location: Lake Wales FL. Status: Offline Points: 8193 |
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as you know...I understand none of what these guys are talking about....but I sure like the way they say it. john |
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"Loud pipes save lives"
AdamT sez "I'm Canadian and a beaver lover myself"... |
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jerry.nichols@m
Newbie Joined: November-05-2007 Location: United States Status: Offline Points: 10 |
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Hi Guys,
I'm back from the dealer with some more info: 1. I independently (second opinion) confirmed close to zero compression on #8 cylinder (not number 7 as previously posted). 2. Mechanic pulled valve covers and found a tuliped valve. Mechanic said this was most likely cause by overheating. I'm a bit surprised at this as I'm a pretty conscious gauge watcher, not just upon start up, but while under way as well.) 3. Oil was not dirty at all 4. Mechanic stated that since #8 cylinder had no compression, it was just going along for the ride thanks to the other 7 cylinders. 5. Mechanic said we still need to pull the motor and have it machined to re-surface the cylinder before replacing the tuliped valve. 6. Mechanic said I may want to consider re-surfacing all 8 cylinder as the incremental cost to do all of them is fairly minor since the motor is out already. 7. I've asked the shop to write up the complete estimate which he is doing now, but the "rough" estimated is now $1500-$2000. Depending on the cost, I am leaning toward resurfacing all 8 cylinders. Does this sound like a good idea? What do you all think of this information? |
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rolleronariver
Senior Member Joined: May-24-2016 Location: Rogers, AR Status: Offline Points: 195 |
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Sounds like this guys knows more about engines then the first guy. That price doesn't sound horrible if he's doing all of the work but I do all of my own work so I could be wrong.
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92 Sport nautique
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baitkiller
Platinum Member Joined: October-11-2011 Location: SW Florida Status: Offline Points: 1693 |
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I think that sounds cheap. I also don't buy the overheat but whatevs...I still think youll find a corroded valve stem / seat as cause of the bad valve and glazed cylinder walls. Was the pushrod bent?
150 ring set 250 gasket set Big and small end bearing sets? ~75 ish? Plus valve job. That has to be >500 these days right?. and labor. Ill wait for the others. Thanks for the update. |
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Jesus was a bare-footer.............
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81nautique
Grand Poobah Joined: September-03-2005 Location: Big Rock, Il Status: Offline Points: 5778 |
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From personal experience I have seen tuliped valves on a fuel injected motor that had a bad high pressure fuel pump. Run em hard, it leans out and proceeds to melt valves. Your cooling system may still be functioning properly but this is a lean fuel condition. It happens quick. Your boat should go into limp mode if it's overheating but it's not. I am certain this is fuel related.
If the motor has to come out do all 8 holes, get the heads repaired and put it all back together but don't run it until you thoroughly check the fuel system. Price for all that work sounds very reasonable. |
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