Engine knocking...

[xj4life2]

I would highly recomend that you get a stethascope and locate the source of the knock . I have seen alot of cherokee's that are mis diagnosed with a rod knock and its actually a bad lifter, just a thought !!!

[pvt.tadpolxj]

Thank's everybody. this post is such a big help fpr me. I did install the 20W50 0il today and it is still knocking, but man it is running a lot smoother. I really appreciate the qoute about checking my lifter's I know there is no adjustment, but it will be worth the check anyway. Maybe I will be lucky and some of them have worked loose and need to be retorqued.

[mw14c]

PLEASE DO NOT PUT GEAR LUBE IN YOUR ENGINE!! Gear lube is not the same as engine oil. It is "Hypoid" oil and does not have have any lubricating properties related to engines. Check your flex plate first. Pull plug wires one at a time. If the knock goes away with one you probably have a loose rod bearing. The reason the noise is coming from the top end is because the piston is traveling to far upwards via loose bearing and hitting the head. Removing ignition to that cylinder will relieve stress and allow piston to "free float". Everyone thinks connecting rod bearings should be heard in the bottom end but its seldom the case.

[pvt.tadpolxj]

Thank's Friend.....I have solved most of the engine noise by running Valvoline VR1 oil....10w30......It is Racing oil and has diffrent propertie's than conventional oil's....It is also very high in Zinc/ Phosporous......