Low compression and oil burning on 84 FJ60 2F problem

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Mar 1, 2018
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Johns Creek Georgia
I will try to make this as brief as possible. My son bought an 84 FJ60 with a 2F de-smoged engine, no cat and 212000 miles. The car sat in a repair shop for almost 3 years. We got everything back in order and got it on the road BUT it was smoking blue after it sits at a light and also noticed puffs of blue starting and when backing off the gas. I figured it would have some stuck rings after sitting and added 1qt of Marvel Mystery oil to the new oil and drove it for 2 weeks to see if it would free up/clean the rings. It seemed to work and the blue smoke tapered way down. I checked the oil and it was 2 quarts low. Added more oil and it immediately started smoking again. Did a compression test yesterday. Cylinders #'s 1, 4,5,6 are at 170 lbs Cyl 2 is 165 and cyl # 3 is 150. I squirted oil in #3 and it tested 170 after. Thinking stuck rings (i hope). After reading different posts on freeing stuck rings, I removed the plugs, poured Berrymans 12 cleaner into the #3, let it sit for 20 mins, then pumped 120lbs of air to force it through the rings. changed the oil and let it sit over night and started it this morning and it is smoking slightly but not as much (so far).

Question: Does this sound like stuck rings possibly and is there another way to free them of figure if the problem is something else???? Am I on the right track?

PS, WORD OF CAUTION from a dumb ass (me). IF you ever do the berryman thing BE CAREFUL when you try to dry out the cylinders by turning the engine over to get the excess fluid out. Even though I had disconnected the coil wire, I put a piece of corrugated plastic between the engine and the fender to keep any excess fluid from getting on the paint. The engine caught fire when I turned it over and luckily I was prepared and got it out quickly, but it could have been bad.
 
Really stuck rings will get a compression reading of 0-100psi.

Your numbers are normal hi-mileage readings.

The best thing for carboned rings is to fill the crankcase with good quality modern oil, either a 15W40 dino or 5W40 synth, and drive it. The condition that carboned the rings was infrequent oil changes with the crap oil available 25 years ago.
 
With that kind of miles and sitting, I highly suspect it needs new valve stem seals.
 
Really stuck rings will get a compression reading of 0-100psi.

Your numbers are normal hi-mileage readings.

The best thing for carboned rings is to fill the crankcase with good quality modern oil, either a 15W40 dino or 5W40 synth, and drive it. The condition that carboned the rings was infrequent oil changes with the crap oil available 25 years ago.


Actually that makes a lot of sense but I would not have thought of that. The oil of yesterday was crap and I am pretty sure this engine had many owners and some who did not do regular maintenance. Funny thing to remember but my late father was a stickler for regular maintenance and especially oil changes. If my brother or me ever showed up during a visit and our was low or appeared dirty, we would never hear the end of it.

Thanks Jim
 
With that kind of miles and sitting, I highly suspect it needs new valve stem seals.
thanks to you and OSS too, the valve stem seals are probably shot too. I will get on that right away. Wish I could do it without removing the head, but maybe it could use a valve job too.

thanks
 
Search here in mud too. Folks have done it. Some funky trick stuffing rope into the plug hole....
 
This one the guy makes a tool from an old spark plug for compressed air to hold the valves closed.

 

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