The Ford Barn - View Single Post - Low Compression

Kruzn40 · 02-12-2019, 02:53 PM

if you have sticky rings and valves then Marvel Mystery Oil is your friend. Put a good dose in each cylinder and let that marinate for several days while turning the motor over by hand a couple of times in the interim.

I did this with a modern OT motor that had been sitting idle for several years that I bought for an old truck project. When fire up day finally arrived I found that the compression was so low that it wouldn't start. I used the MMO process and after a few days i removed the spark plugs and spun it over with the starter to blow out the excess oil, put the plugs back in and she started!! on about 5 cylinders, but the longer it ran the smoother it got and after about 15 minutes it was purring like a kitten, and after 25K miles it still does.
Good luck......

02-12-2019, 02:53 PM	#13
Kruzn40 Member Join Date: Sep 2010 Location: Menifee, CA Posts: 61	Re: Low Compression - keep trying or rebuild? if you have sticky rings and valves then Marvel Mystery Oil is your friend. Put a good dose in each cylinder and let that marinate for several days while turning the motor over by hand a couple of times in the interim. I did this with a modern OT motor that had been sitting idle for several years that I bought for an old truck project. When fire up day finally arrived I found that the compression was so low that it wouldn't start. I used the MMO process and after a few days i removed the spark plugs and spun it over with the starter to blow out the excess oil, put the plugs back in and she started!! on about 5 cylinders, but the longer it ran the smoother it got and after about 15 minutes it was purring like a kitten, and after 25K miles it still does. Good luck......