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| Engine Woes https://www.smwebhead.com/phpBB3/viewtopic.php?f=11&t=12040 |
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| Author: | acguy [ Wed Jul 24, 2013 5:04 pm ] |
| Post subject: | Engine Woes |
So i have been dealing with this for the last week. Found out i have 0 compression in my #6 cylinder and have had a leak down test performed and there is 100% leakage is what i have been told by our marina. I have been told it it is the top end and the heads (both) should be removed and sent to the machine shop for inspection/repair. My question is so far does this sound right and what should i expect for hours by the marina on this task? Also is there any thing else i need to have done if they the determine that it was a faulty valve. Oh and they took the valve cover off to ensure there was no easy fix like a bad spring. Just looking for info and input. |
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| Author: | JohnnyMarlin [ Wed Jul 24, 2013 5:21 pm ] |
| Post subject: | Re: Engine Woes |
My question would be WHY?..........did you have a manifold leak raw water into the exhaust port?..........If so, you will need manifolds as well.......... |
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| Author: | acguy [ Wed Jul 24, 2013 8:53 pm ] |
| Post subject: | Re: Engine Woes |
JohnnyMarlin wrote: My question would be WHY?..........did you have a manifold leak raw water into the exhaust port?..........If so, you will need manifolds as well.......... My question as well. To my knowledge so far this is not the case. I have been told by several auto mechanics so far that it is not uncommon to loose a valve in a 350. Before we purchased the boat it was laid up for almost 1 year. Maybe they did not fog the engine? |
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| Author: | 230 Mike [ Wed Jul 24, 2013 9:29 pm ] |
| Post subject: | Re: Engine Woes |
What was the original symptom? |
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| Author: | acguy [ Wed Jul 24, 2013 9:47 pm ] |
| Post subject: | Re: Engine Woes |
Rough idle at 600 rpm no signs of lack of power. Always had a little smoke on the port engine at start up not dark but maybe blueish in color |
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| Author: | Decision [ Wed Jul 24, 2013 9:50 pm ] |
| Post subject: | Re: Engine Woes |
Sorry to hear of your engine issue Mike. How many hours have you logged on your boat since purchase? Did it achieve the specified WOT RPM and corresponding MPH when you purchased your 328? Mike. |
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| Author: | 230 Mike [ Wed Jul 24, 2013 10:29 pm ] |
| Post subject: | Re: Engine Woes |
Sounds like it could just be a bad valve seal. |
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| Author: | acguy [ Thu Jul 25, 2013 5:43 am ] |
| Post subject: | Re: Engine Woes |
Decision wrote: Sorry to hear of your engine issue Mike. How many hours have you logged on your boat since purchase? Did it achieve the specified WOT RPM and corresponding MPH when you purchased your 328? Mike. I have 550 hours on that engine and have never had any issues making power wot rpm was always in range at 4800. I have put roughly 45 hrs on it since last Sept I suspect it is a stuck valve and with the smoke at startup that would correspond to a valve not seating and oil drping into the combustion chamber and smoking a little at start up |
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| Author: | neutron [ Thu Jul 25, 2013 7:04 am ] |
| Post subject: | Re: Engine Woes |
I would have the valve cover pulled in the boat before the head is removed because if its just a broken valve spring it can be replaced without pulling the head.. at the same time you can replace all the valve seals also without pulling head |
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| Author: | rpengr [ Thu Jul 25, 2013 1:20 pm ] |
| Post subject: | Re: Engine Woes |
Yes, blue smoke on startup indicates bad valve seal. Not a big deal by itself. Your compression problem is likely to be a "Tuliped" Valve. Not unheard of at 500 hours. This article blames it on being overpropped for the load condition: http://www.perfprotech.com/blog/articles/marine-engine-condition-2# I don't know what price you are looking at, but a valve job is a whole lot better than having to remove the whole engine. The way to save the most money is to remove/reinstall the heads yourself, if you are so inclined, and you could have the heads rebuilt by an automotive machine shop instead of a marina. I suggest sending a PM to DaleG. He has been through this recently, and used upgraded valves when he had the heads rebuilt. Maybe he could give you suggestions Ray |
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| Author: | LouC [ Thu Jul 25, 2013 4:23 pm ] |
| Post subject: | Re: Engine Woes |
This can be cause also by a small leak from the exhaust system down the manifold which collects in a exhaust port, you can actually see a trail of water stains and it can corrode the valve stem which makes it stick. I think the dry joint manifolds that Merc came up with, or a one piece design like OMC used to use, is superior to the 2 piece design used on most I/Os and inboards. There is only a 1/4" or so wide sealing surface between the cooling passage and the exhaust passage and when it gets corroded, that gasket starts to leak. The next time I replace the manifolds on this boat I'd like to see if I can adapt the Merc dry joint system. One less thing to worry about. I like the OMC one piece manifolds but you can't get them any more. |
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| Author: | acguy [ Sat Jul 27, 2013 1:10 pm ] |
| Post subject: | Re: Engine Woes |
Update: Had both heads removed and sent to the machine shop. They did find a tuliped valve. I am having all the intake valves replaced also had a bad head gasket on the 1 side. The machine shop will strip both down and blast them, magnaflux, resurface and new gaskets and also I have decided to replace the spring since it will be all apart. I am told there are no issues with the exhaust valves! Should all be done in time for our long weekend next week!!! |
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| Author: | neutron [ Sat Jul 27, 2013 3:04 pm ] |
| Post subject: | Re: Engine Woes |
Thats good news sort of. Glad to hear you will be back out soon. |
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| Author: | Decision [ Sat Jul 27, 2013 6:29 pm ] |
| Post subject: | Re: Engine Woes |
Great to hear you will be back up and running for the long weekend next weekend. We are going to get a early start to the long weekend be leaving for the boat on Wednesday evening. Hope the engine repair meets your full expectation. Mike. |
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| Author: | acguy [ Sat Jul 27, 2013 7:13 pm ] |
| Post subject: | Re: Engine Woes |
neutron wrote: Thats good news sort of. Glad to hear you will be back out soon. Yes i guess that's better than having bottom end issues. Like I've said before " It's nothing money can't fix" just need to find the money tree. To add salt to the wound the wife's washer and dryer gave up the ghost they were on there last legs and gave out this week. It's getting expensive real fast around here!!!!!!!!!!!!!! |
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