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dkr
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PostPosted: Mon Mar 24, 2014 11:37 am    Post subject: Help Reply to specific post Reply with quote

I have a 5 STar I just rebuilt. M5 jugs bored to 4.8" with Ross pistons and new rings that came through Ross. Engine ran ratty so I checked and found #3 & 4 dead. Compression was 0. #1 & 2 were 240.Expecting broken rings or burned pistons, we removed the pistons and found everything good except we could see where the valve impressions could barely be seen on the piston surface. The rear of #3 piston was worn at the top with obvious scraping and a little scarring on the cylinder. We couldn't see anything wrong with #4 piston or cylinder. Does anyone have an idea what might be my problem. Thanks for any help.
 
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jd plowboy
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PostPosted: Mon Mar 24, 2014 12:38 pm    Post subject: Re: Help Reply to specific post Reply with quote

are the intake gaskets good. i had a 605 that wouldnt fire and the gaskets was bad.
 
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dkr
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PostPosted: Mon Mar 24, 2014 1:11 pm    Post subject: Re: Help Reply to specific post Reply with quote

Thanks, JD. I noticed they need replacing. But, would that account for the lack of compression?
 
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jd plowboy
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PostPosted: Mon Mar 24, 2014 1:59 pm    Post subject: Re: Help Reply to specific post Reply with quote

im not sure of that but would try that first. i had a 6 cylinder moline that would skip on 1 head and we changed the intake and exhaust gaskets and it ran fine. if they look like they need replacing that could be the problem
 
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klw445
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PostPosted: Mon Mar 24, 2014 7:08 pm    Post subject: Re: Help Reply to specific post Reply with quote

Had that happen once on a U. I got in a hurry when installing the push rods and rockers. They were not seated in the lifters correctly and after it started they fell into place. Resulted in failure to open the valve. I sure was glad it was that easy. Hopefully yours will be that simple as well???
 
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Kevin Moschenrose
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PostPosted: Mon Mar 24, 2014 8:50 pm    Post subject: Re: Help Reply to specific post Reply with quote

Bad intake gaskets have nothing to do with low compression or a lack of.
 
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jd plowboy
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PostPosted: Tue Mar 25, 2014 2:49 am    Post subject: Re: Help Reply to specific post Reply with quote

thats why i said what i did but the one head on the 605 was dead and after the gaskets it ran like it should have
 
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MMfan
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PostPosted: Tue Mar 25, 2014 4:05 am    Post subject: Re: Help Reply to specific post Reply with quote

If everything looks good up top, it may be a valve not seating or hanging open some. I like to make an adapter for the compression tester to put compressed air in the cylinder. Lets you get an idea where the leak is.
 
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Kevin Moschenrose
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PostPosted: Tue Mar 25, 2014 8:10 am    Post subject: Re: Help Reply to specific post Reply with quote

Bad intake gaskets would make the fuel/air ratio way to lean too run correctly if at all.
 
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dkr
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PostPosted: Tue Mar 25, 2014 11:03 am    Post subject: Re: Help Reply to specific post Reply with quote

Jason, we crancked it over while watching the valve action and all the valves were coming back to the top. I agree with you that for some reason the valves are open when the piston comes to the top. How else could there be valve marks on the pistons. You would think valve timing, but #1 & #2 are fine. Scratching my head here.
 
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Kevin Moschenrose
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PostPosted: Tue Mar 25, 2014 8:49 pm    Post subject: Re: Help Reply to specific post Reply with quote

It maybe the valves are not fully closing when they should via hanging up in the guides or weak springs maybe?
 
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dkr
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PostPosted: Wed Mar 26, 2014 5:19 am    Post subject: Re: Help Reply to specific post Reply with quote

We thought about that and actually watched the valve action when it was running. They all worked normally. I'm lost.
 
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MMDEL
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PostPosted: Wed Mar 26, 2014 7:38 am    Post subject: Re: Help Reply to specific post Reply with quote

Did you have the cam out since it ran correctly??
MMDEL
 
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dkr
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PostPosted: Wed Mar 26, 2014 8:31 am    Post subject: Re: Help Reply to specific post Reply with quote

MMDEL, this is gonna sound stupid, but, I can't remember. Immediately after I tore it down my wife died and I sorta lost interest in it for a couple of years. It's been about 2 - 1/2 years now since I tore it down so I really don't remember, which is not unusual for me. I had to change out the timing gear so I guess there's a chance I did remove it. What might be the downside of that?
 
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Howard H.
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PostPosted: Wed Mar 26, 2014 8:55 am    Post subject: Re: Help Reply to specific post Reply with quote


Are you sure the head gasket made a good seal??

There isn't a chance it is/was blowing between the 3 & 4 cylinders, is there??

Did the valve adjustments seem to feel right when you set the valves??


Howard
 
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