TIMH
NAXJA Forum User
- Location
- New Egypt, NJ
Picked up a parts 2000 XJ. Getting ready to pull the engine and looked at the Cylinder Head for casting number. Its marked 059? Never seen that before. Anyone have any info? Thanks
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4.0 059 Cylinder Head Info
- Thread starter TIMH
- Start date
lazyxj
NAXJA Member #1310
- Location
- Los Angeles
If it is the stock head, it's a crack prone 0331.
My 2001 XJ's engine has 125,000 miles on it. The head was off at 95,000 for rebuilding, due to a burnt valve. It was magnafluxed and found to be crack free, so don't assume that your head must have issues.
Do pull the valve cover off and look for a developing crack between number 3 and 4 cylinders.
My 2001 XJ's engine has 125,000 miles on it. The head was off at 95,000 for rebuilding, due to a burnt valve. It was magnafluxed and found to be crack free, so don't assume that your head must have issues.
Do pull the valve cover off and look for a developing crack between number 3 and 4 cylinders.
TIMH
NAXJA Forum User
- Location
- New Egypt, NJ
Thanks for the info, that is why I found this has a casting number of 059. Have had a couple 2000/2001. Wife's has 169k on it still going good with a 0331 Head. Just never seen a 059 casting number, its right where 0331 would be cast in.
lazyxj
NAXJA Member #1310
- Location
- Los Angeles
Where is the 059 located, that you are seeing?
The casting model number is usually of on the top of the head, just above number 4's exhaust port. I just checked two 0331 heads and pair of 0630s, all had the model number are located there.
The casting model number is usually of on the top of the head, just above number 4's exhaust port. I just checked two 0331 heads and pair of 0630s, all had the model number are located there.
TIMH
NAXJA Forum User
- Location
- New Egypt, NJ
If I could figure out how to upload a pic, but its right where the 0331 normally would be.
lazyxj
NAXJA Member #1310
- Location
- Los Angeles
I'm stumped. A Goggle search found nothing but a Chevy 059 head.
Maybe the block number will provide an clue, if the head wasn't replaced in the past.
Let us know if you find an answer.
Maybe the block number will provide an clue, if the head wasn't replaced in the past.
Let us know if you find an answer.
- Location
- Minneapolis, MN
The head does not appear to be a stock Jeep head, so it must be some sort of aftermarket replacement. I have seen a similar but unidentified head with a 063 casting number.
Year.......JEEP Casting #
1987-90......2686
1991-95......7120
1996-98......0630
1999-06......0331
Year.......JEEP Casting #
1987-90......2686
1991-95......7120
1996-98......0630
1999-06......0331
lazyxj
NAXJA Member #1310
- Location
- Los Angeles
Does it have a coil pack or a conventional distributor and a separate coil?
An 0331 will have the four threaded bosses for the coil pack. None of the earlier head have the bosses.
If it has the bosses, it may be an aftermarket casting.
An 0331 will have the four threaded bosses for the coil pack. None of the earlier head have the bosses.
If it has the bosses, it may be an aftermarket casting.
