Devilfrog
NAXJA Forum User
- Location
- Duncan, BC
hey guys, got a question about oil pressure.
history was a cracked head ('00 XJ 4.0L auto) at 164,000 kms ... replaced that with a '93HO head, kept the '00 intake and added a SS '93 exhaust. Anyway on to the heart of the question ... I hit about 3.5-4BAR at cold start, and the guage doesn't dip below 1.5BAR until it's run for a few hours ... on the road it climbs back up to 3Bar at 2000rpm and will go to 4Bar when just warmed but stay's at 3Bar after it's run for a few hours. At idle after running for a while the needle will dip to .75-1Bar but climbs back to 2-3Bar when driving.
there is also a slight very quiet tapping at all times since before the head issue which I assumed to be a minor pistion slap as every jeep engine (2.5L and 4.0L) I ever heard eventually makes it. it hasn't gotten worse since the head swap.
could this be oil pressure issue be damage from coolant in the oil pan (there was never any vissible mixing in the pan that I ever saw ... no milkshakes here. But even a small amount mixing can cause damage from what I understand.
Or ... am I just being paranoid and it's just another JEEP 4.0L with 175,000 kms.
There are no oil leaks as I fixed the usual oil filter adapter issue with the head swap.
history was a cracked head ('00 XJ 4.0L auto) at 164,000 kms ... replaced that with a '93HO head, kept the '00 intake and added a SS '93 exhaust. Anyway on to the heart of the question ... I hit about 3.5-4BAR at cold start, and the guage doesn't dip below 1.5BAR until it's run for a few hours ... on the road it climbs back up to 3Bar at 2000rpm and will go to 4Bar when just warmed but stay's at 3Bar after it's run for a few hours. At idle after running for a while the needle will dip to .75-1Bar but climbs back to 2-3Bar when driving.
there is also a slight very quiet tapping at all times since before the head issue which I assumed to be a minor pistion slap as every jeep engine (2.5L and 4.0L) I ever heard eventually makes it. it hasn't gotten worse since the head swap.
could this be oil pressure issue be damage from coolant in the oil pan (there was never any vissible mixing in the pan that I ever saw ... no milkshakes here. But even a small amount mixing can cause damage from what I understand.
Or ... am I just being paranoid and it's just another JEEP 4.0L with 175,000 kms.
There are no oil leaks as I fixed the usual oil filter adapter issue with the head swap.