There are There very common causes for an oil pressure warning light on a Jeep 3.6 V6 wrangler.
The first is the faulty oil pressure switch which you can read up on by clicking here.
The second is a semi common fault with the Oil pump itself.
The third is this particular fault which is always after the replacement of the cylinder heads.
Usually this issue is caused by the person a workshop or individual outsources the head machining and pressure testing to. There are two small bolts on each cylinder head in line with the camshafts that appear to do nothing.
Many head machinists accidentally or deliberately leave these out believing they do nothing. Be warned. They Do something. The lack of these four bolts (two in each cylinder head) cause the cylinder head to have reduced oil pressure which will bring the check engine light on and can cause damage to the cylinder heads due to the lack of significant oil pressure to the camshafts.
The picture below shows two of the bolts in question.
Jeep Expert Sydney you have just replaced the cylinder head gaskets or heads themselves in a 3.6 jeep engine and now have the warning lights on for check engine and oil pressure. you need to make sure these bolts are fitted before you go any further.
To fit these bolts if they have been left out, you will need to remove the inlet manifold and the valve covers again. then remove the timing cover. You can replace these without removing the timing chains.
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