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Re: oil leak from rocker box on 1996jeep cherokee2.5td
Get you a new gasket for the rocker cover, make sure you clean the mating surface good,and all traces of old gasket, and silicon etc. make sure you dont overtighten the bolts to the rocker cover. the torque for the rocker cover is 35 in lbs (4nm). as far as vavle clearance it is none adjustable. A clicking valve can indicate worn lifters, sometimes an oil change will quiet down noisy lifters. If noisy lifters persist you would have to service the heads. If you decide to do that yourself you can ask for a procedure on that too later on. Removal of the head is very difficult, because you need to remove a lot of things, and require you to do a timing on the engine.
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Valve lash is the end of the rocker arm and the valve stem clearance between. When the engine is running, due to the thermal expansion and contraction, if there is no gap between the rocker arm and the valve stem, rocker arm swells, the top valve open, the impact of engine power and economy. Engine valve clearance will be different, usually when the car is cold, the intake valve 0.08-0.10MM, clearance exhaust valves 0.10-0.12MM Car Diagnostic Tool
comment exactly what you mean when you say --covered in oil
1-- is they covered in oil on the outside around the insulator and wires/ coils
2-- are the center electrodes black with oil and misfiring
if it the outside then replace the rocker cover gasket or if the plugs are recessed into the rocker cover , replace the oil seal under the plug tube in the rocker cover
Check the sump gasket at the rear of the sump tension sump bolts. Check that the rocker cover gasket is not leaking down the back of the engine and giving the appearance of a sump leak. Rear crank seal would be another point of leak and front input shaft (clutch shaft) seal leaking. Check the engine oil level and correct if necessary and check gear box oil level and correct if necessary. If you have an auto the oil will be pinkish and indicates a torque converter to gear box seal leaking.. Either of the shaft seals will require the box removal for repair.
Take the rocker cover and the upper timing belt cover off.
Set No 1 Cylinder to TDC - use the markings on the cam spocket to get this - and confirm it's on the compression stroke by check both inlet and exhaust valves are closed and on the heel of the cam.
In this position, check rockers 1,2,4 and 5.
Take care with the feeler guage to make sure you're right under the pad under the adjuster screw properly and completely passing under it, not sticking part way.
Rotate the engine (crank shaft) 360 degrees. This should bring No 4 to TDC - confirm that both inlet and exhaust valves are closed and on the heel of the cam.
In this position, check rockers 3,6,7 and 8.
Clearance for Intake and Exhaust is 0.25mm at normal engine operating temp.
Don't forget to fit a new rocker cover gasket and half moon seal (use something like Hylomar to help make sure the half moon is sealed properly - usual suspect when rocker cover leaks at the back of the engine).
you don`t say what type of noise the motor is making,so here are some things it could be.it could be thinned out motor oil due to not being changed regularly or low on oil,the camshaft could be worn,the valve lifters could be worn out or the rocker arms which will need replacing,the valves may need adjusting(rocker arms too much clearance)the noise could be from the worn pistons or the connecting rod bearings worn causing too much clearance making noise.the noise needs to be diagnoised in order to determine what needs to be done.the wire at the fuse box was it to by pass the fuse panel to get the fan to work correctly.if so it should be properly repaired to avoid a possible fire,which your insurance company probably would not cover as the system was tampered with.
No this is not mormal. I am assuming you are saying there is oil on the outside of the spark plug and not on the electrode when you removed it. If you have oil on the outside of the plug your valve cover gasket is leaking. Try tightening the valve cover down ever so slightly. DO NOT over-tighten. If that does not work then the gasket will need to be replaced. Unless it is leaking lots of oil, you may just want to live with it as it is expensive to pay someone to replace the valve cover gaskets.