No compression on one cylinder 93 Johnson 88 spl

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SteuryLover

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Re: No compression on one cylinder 93 Johnson 88 spl

Cool, got it and order in. I also ordered a thermostat kit and water pump kit with housing and water deflectors. Should I order the exhaust gasket as well? It seems to be ok. Do you think I should replace the temp switch? Do I need any sealant for the install of the head gasket? I can clearly see the water deflectors, they look collapsed. The book does not really go over the removal and install of these. Thanks again for all the help.
 
iwombat

iwombat

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Re: No compression on one cylinder 93 Johnson 88 spl

Most of the new gaskets come with a coating eliminating the need for any sealers.

As for the deflectors - just pull the old ones out and put the new ones in.
 
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SteuryLover

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Re: No compression on one cylinder 93 Johnson 88 spl

Simple as that huh, nice. I put the order in today on iBoats for all the parts you all recommended. I will keep everyone posted on the progress. Any more input is greatly appreciated.
 
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SteuryLover

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Re: No compression on one cylinder 93 Johnson 88 spl

Alright, got all my parts to do the head job. After replacing the head gasket my compression went from a big fat goose egg to 115! Now all cylinders read from 110-120. I am a happy camper. One question I have is will the compression change once the motor is started, ran and re torqued? It was a little more even I think before the rebuild. I also bought a can of Seafoam, what is the best way to apply the bottle I have? Thanks for the help fixing my motor!
 
iwombat

iwombat

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Re: No compression on one cylinder 93 Johnson 88 spl

It'll change a little once you get oil back in the cylinders and get the motor warm. Those are good numbers though, and I wouldn't be complaining.

I add a full can of seafoam to 1 gal of my normal fuel mix and run it. There's variations on that theme, but I keep it as simple as possible. I run it on the muffs in 15 minute increments until the fuel is gone or I get tired of the whole process. 15 on 15 off.
 
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ezeke

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SteuryLover

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Re: No compression on one cylinder 93 Johnson 88 spl

Great info, I really appreciate all the help. For my first time doing this I owe it all to the help from iboats. You guys really got it down.
 
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SteuryLover

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Re: No compression on one cylinder 93 Johnson 88 spl

Well boat ran great this weekend. No over heating, solid idle and trolling. My last question regarding the head gaskets I replaced. I know I read 10 hours of running then re-torque. Can this be combined over a few trips? Anything else I should know about this job is appreciated. Thanks for the time.
 
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ezeke

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Re: No compression on one cylinder 93 Johnson 88 spl

I re-torque as soon as I feel the new gasket should have seated from normal running; I would do that now if it were my engine.
 
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SteuryLover

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Re: No compression on one cylinder 93 Johnson 88 spl

That is where I was going with this. I figured it got heated up, I ran it for about an hour. I will re-torque, 22lbs sound good? I know my book stated 20-22lbs. Thanks for the quick response.
 
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ezeke

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Re: No compression on one cylinder 93 Johnson 88 spl

I think 18-20 ft lbs is recommended.
 
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SteuryLover

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Re: No compression on one cylinder 93 Johnson 88 spl

You are correct, 18-20lbs. I just did my LU and that is what the main 4 bolts called for. I noticed one of the head covers was leaking around the water jacket. Will replacing those do anything to interfere with the head gaskets? Thanks again for all the help.
 
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ezeke

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Re: No compression on one cylinder 93 Johnson 88 spl

There should be no effect on the cylinder head gasket.

The cover screws are torqued to 60-84 inch pounds. Use gasket sealing compound.
 
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SteuryLover

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Messages
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Re: No compression on one cylinder 93 Johnson 88 spl

Great, I ordered the gaskets from iboats last week. I will install them next week. Thanks for the help.
 
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