Low compression - Rebuild it?
Thread Starter
Joined: Dec 2017
Posts: 19
Low compression - Rebuild it?
Hey everyone the question for today is here a few months ago my maxima development a miss did some testing found a cylinder with substantial less compression then the other five we believe the rings are bad my question is should I rebuild it or scrap it and if I rebuild it how should I rebuild it
Senior Member
Joined: Oct 2012
Posts: 2,974
From: Portland, Oregon
Your problem is most likely a valve.
Look up how to perform a wet and dry compression test. That will indicate if the if the problem is the ring or the valve.
Still, used engines are easier to install, and probably cheaper than repairing yours. I would buy a lower mileage engine, then reseal the valve covers, install a new water pump, new or rebuilt rear fuel injectors, clean out the egr tube, and any thing else I could think of which can be done much easier when the engine is out of the car, and easy to work on.
Look up how to perform a wet and dry compression test. That will indicate if the if the problem is the ring or the valve.
Still, used engines are easier to install, and probably cheaper than repairing yours. I would buy a lower mileage engine, then reseal the valve covers, install a new water pump, new or rebuilt rear fuel injectors, clean out the egr tube, and any thing else I could think of which can be done much easier when the engine is out of the car, and easy to work on.
Thread Starter
Joined: Dec 2017
Posts: 19
Your problem is most likely a valve.
Look up how to perform a wet and dry compression test. That will indicate if the if the problem is the ring or the valve.
Still, used engines are easier to install, and probably cheaper than repairing yours. I would buy a lower mileage engine, then reseal the valve covers, install a new water pump, new or rebuilt rear fuel injectors, clean out the egr tube, and any thing else I could think of which can be done much easier when the engine is out of the car, and easy to work on.
Look up how to perform a wet and dry compression test. That will indicate if the if the problem is the ring or the valve.
Still, used engines are easier to install, and probably cheaper than repairing yours. I would buy a lower mileage engine, then reseal the valve covers, install a new water pump, new or rebuilt rear fuel injectors, clean out the egr tube, and any thing else I could think of which can be done much easier when the engine is out of the car, and easy to work on.
Senior Member
Joined: Oct 2012
Posts: 2,974
From: Portland, Oregon
Yup, rings.
But, since your have nothing to lose, you might try some chemical treatments which are intended to dissolve deposits on rings and valves.
Sea foam in the oil and gasoline for example.
or Marvel Mystery Oil.
Or harsher methods such as GM cylinder cleaner.
Tell the Chevy parts guy that you want to free your rings by doing an engine soak. They sell the chemical.
Note...... rings can be weak due to wear and tear. Only replacing them will help.
However, ...... some owners doon change oil frequently enough, so the crud in the oil creates deposits which cause rings to stick.
But, since your have nothing to lose, you might try some chemical treatments which are intended to dissolve deposits on rings and valves.
Sea foam in the oil and gasoline for example.
or Marvel Mystery Oil.
Or harsher methods such as GM cylinder cleaner.
Tell the Chevy parts guy that you want to free your rings by doing an engine soak. They sell the chemical.
Note...... rings can be weak due to wear and tear. Only replacing them will help.
However, ...... some owners doon change oil frequently enough, so the crud in the oil creates deposits which cause rings to stick.
I got a vq35 from car-part.com and the engine had no compression at all. I took the engine apart and all the rings were stuck in the pistons. Just make sure you buy from a reliable place with a decent warranty. Mine didnt have one.
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cjficklin
3rd Generation Maxima (1989-1994)
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Jan 12, 2004 09:47 PM