Could it just be stuck rings?
Well, I have a 1975 Ford F-150 passed down from my grandpa, to my Dad, to me.
The poor thing smokes like crazy! Also uses lots of oil. I mean LOTS, like a couple quarts a week.
The truck sat for many years without being driven, then people started using it to haul things, it probably has been driven around 6,000 miles since it sat.
The whole time, through around 6,000 miles, it has smoked and burned oil. The engine only has 60,000 total miles on it though, and it has never been rebuilt. Nothing on the truck has more than 60,000 miles. People never changed the oil either, they just ran it with dirty sludge oil. So sad. My stupid family ruined this truck!
I am wondering if maybe it just had stuck rings from sitting all those years, but now, nobody tried to fix the problem, and just drove the hell out of it, so I dunno if the rings could really be stuck after all this time.
I did a compression test and found that cylinders 3,4,7,8 all have perfect compression (the rear-most 4 cylinders). The front 4 cylinders, however, start at 60 PSI on the first crank and the compression builds up to 90 PSI after about 5 cranks on one of them, 2 of them start at 60 PSI and build up to 120 PSI, and the last one starts at 90 PSI and builds up to 120 PSI.
The wet compression test gives 120 PSI immediately, which is why I think rings are the cause of the problem.
So, is it possible for all this to be stuck rings, after all this time could they come un-stuck?
Last night I took all the plugs out and filled every cylinder to overflowing with Marvel Mystery Oil. Today when I get home from work I want to turn the engine a little by hand and get most of the oil out, then crank it a little with the starter and no plugs, then finally start it up. The darn engine runs smooth and sounds great, it's so sad about the burning oil.
So, if I do this, and run the engine a bit, it should burn out the marvel right? Then I can do a compression test and see if that helped?
Has anyone had stuck rings before and been able to free them up by pouring stuff into the cylinders or something?
Any advice would be appreciated. Such a shame to ruin a perfectly good pickup truck.
If worst comes to worst, there is a rebuilt engine I found for $500 that comes with all the manifolds, carb, starter, and everything, some guy set it all up then never finished the vehicle it was to go in, so I'll buy his engine if this one is a goner.