help !! lifter noise!!
#1
Hi there
I need your help !! I had a lifter noise on my car (351 CJ) I changed the lifters, camshaft, water pump (to stay on the safe side) and the timing chain/sprockets.. The noise is still there!
When I start the engine nothing after 1 or 2 minutes around 1500RPM this lifter noise appears Upper RPM less noise or no noise....I removed one at the time spark plugs cable to check if it was one particular cylinder.. no same with any cylinder out …Any idea ? My oil pressure is somehow inconsistent in the beginning (cold) it's in the middle of the gauge when hot it's very low..far left side..of the gauge.. .. So oil pump+ shaft? Camshaft bearings ,main bearings? How to identify which one it is?
is a valve clearance / spring also an option..I didn't notice when changing the lifters but I was so confident it was a lifter problem I maybe didn't pay enough attention..
Otherwise the engine start and run perfectly..
I guess I will check the oil pressure with an outboard gauge..stock one is maybe not reliable enough??
let me know what do you think
Thanks a lot ..guys
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#2
2 things I would try, and this is a total guess.

First,
Check for any exhaust leaks. I had a sound I swore was a lifter noise but after taking it in to a shop I sort of trust it was determined it was an exhaust leak.

If the above is determined not to be the problem,
run thicker oil. Try going with a straight high quality 50 weight oil.

Im sure some of the other guys here might have more ideas.

Either way keep up updated on this one please!
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#3
How many miles are on this engine? Was anything ever done to it internally?(beside what you just did). Is the noise a tapping/ticking sound, or a deeper knocking? Does it sound like one distinct noise, or a lot of things rattling around? Can you pinpoint exactly where it's coming from? Hard to diagnose over the internet, but maybe with more info, we can be of help.

I agree that connecting a mechanical oil pressure gauge would let you verify the operation of the stock gauge, and also if your pressure is low.

Let us know your findings.
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#4
thanks a lot..
the engine has about 80 Kmiles (118133 km) no deep knock really sound like tired lifters..no from one cylinder..
I will check oil pressure and valve clearance first.it will take a while because I am busy right now and then get some vaccations !!
I planned an all check up for the mach in september
I ll definitly let you know
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