#1 cylinder has 36psi compression on the engine we just re-sealed ( gasket job )
has 35psi in cylinder #1 and 55PSI in the other 3. we added oil to #1 and re-tested the compression, it rose to 50psi. besides a drop in power, are there any short term issues with having it like this ? We are trying to get the car in the 4th of July parade, the radiator is good, along with the rest of the drive line ? after this we will replace the pistons. standard bore size. ( sleeved ) |
Re: #1 cylinder has 36psi compression New rings trying to seal?
Water bubbling in radiator top? If water in cylinder not a good thing. Chipped valve? |
Re: #1 cylinder has 36psi compression thanks,
good questions: re Q1: --> no water bubbling up in Radiator re Q2.) not a chipped valve as they looked good when we had the head off. but some sort of valve sealing issue is possible. ------- I'll do a cylinder leak test next. But I omitted the puffs of smoke from the oil filler tube tube a low idle speed. this is why I think it's the rings / Cylinder wall leak. |
Re: #1 cylinder has 36psi compression Short term, won't hurt a thing providing it is not a valve leaking. At that point, it can likely hurt a valve seat.
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Re: #1 cylinder has 36psi compression Adding oil seals the rings, does nothing to/for the valves.
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Re: #1 cylinder has 36psi compression If it hasn't been started it could just be debris on the valve seat that will leave after it is running
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Re: #1 cylinder has 36psi compression Thank you DHZIEMAN & All,
the engine we re-sealed for a swap was a "used" engine, the history we know it ran before it was removed, but rarely does one just remove a "perfect" engine. so we knew there was risk of some issue, this why we pulled the head etc. I'll pressure up #1 @TDC and see if I can hear where it's leaking later tomorrow. |
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Re: #1 cylinder has 36psi compression Do you have a way to pressurize #1 with air. If you have a n air fitting that will go in the sparkplug hole (leak down of compression tester type) Place #1 at TDC, pump about 10# of air in the cylinder. If you can hear air escaping out the tail pipe, ex. valve, through the carb, int valve. If you can't hear it escaping at all probably rings. Kinda "shade tree" but us country folks have country ways. Chap
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Re: #1 cylinder has 36psi compression I don't think I would do any more testing until I put some serious run time on it.Under a load,not just sitting in the yard.Having worked on old tractors and equipment all my life it is something I have seen a lot of.People will put oil in the cylinders of something that is going to sit,then the winter turns into years.As the Kendall oil rep put it to me,that oil turns into asphalt in the piston rings.It will wash with run time.I have a Ferguson-Ford here that the owner tried to do a leakdown test on.It would hold nothing.After about 40 hours of mowing it runs good,and will hold at least some pressure.
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Re: #1 cylinder has 36psi compression Sea Foam is a great product for engine problems. I've only used it twice and it did wonders both times. About 1980 I added a can to the oil to free up stuck hydraulic lifters, and within 5 miles, the engine was quiet as new. Two months ago I added a can to the gas to help a carb running like crap. Within 20 miles the engine ran smooth as can be.
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Re: #1 cylinder has 36psi compression I fixed a model a engine with 10 psi in one cylinder and 0 in another. Still ran but no power! He had just gone one a one hundred tour with it. It was the valves.
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Re: #1 cylinder has 36psi compression We got this resolved last night.
it seems the valve adjustment on cylinder #1 was not properly done, and they were slightly open...( no tapet clearance ) should be closed., we re-adjusted the #1 cylinder valve clearances and all is working well. I will see if I still have the Puffs of smoke from the oil filler tube, once we test drive and get the rest of the bits put back together. compression test is back at 55PSI. ( stock head ) |
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