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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 11-10-2009   #1 (permalink)
jtettenb is offline Apprentice


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Default loss of compression on one cylinder

some time ago I wrote that I was experiencing a loss of compression in one of my cylinders. After doing a leakdown test I discovered that the ring did not seat properly during break in. The engine has about three thousand miles on it so I assume its too late to get that one to seat. Now I assume the only way to fix this is to take it all apart again, get it machined and install al new rings. This is correct right? I cant afford to do that again so my question is, is it ok to drive it around until I can get it fixed or will this cause damage? I would bring it back to the shop that did the machine work but right after I trailered it three thousand miles away. (a mistake I wont make again) bringing it back would cost more than just having it redone here. any thoughts would be appreciated
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Unread 11-10-2009   #2 (permalink)
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I would think you could just have that one cylinder redone. Anyone else know for sure?
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Unread 11-10-2009   #3 (permalink)
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what type of rings did you use? by having the rings not seated completely could cause it to burn a little bit of oil in that cylinder. it could be because the cylinder was honed to smooth or rough for your type of piston rings.
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Unread 11-10-2009   #4 (permalink)
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Default ring type

I had them put in moly rings. Also is it possible to just take the head off pull that one piston, hone the cylinder and drop it in with new rings? I hate to take shortcuts but I don't have the time, space, or money to do otherwise
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Unread 11-10-2009   #5 (permalink)
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Yeah, pull the block out hone the cylinder, put in new set of rings.

If you are getting blow by, you will get too much heat in the oil, it will break down, you will burn up bearings, all bad.
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Unread 11-10-2009   #6 (permalink)
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Default hone the cylinder

Ok thats good news. I would like to think of myself as mechanically inclined, but I've never honed a cylinder before. do you think this is something I could learn by doing or is this something best left for someone with real experience?
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Unread 11-11-2009   #7 (permalink)
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I think the first thing i would do is to contact the shop that did the engine work for you and see what type if any warranty their might be, maybe they could work something out with you. It may be worth a shot!
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