Camshaft type

[Jarlaxle]

OK, I have searched and didn't find an answer. So, I will ask here: I assumed, being a relatively modern (1991, revised in 1996) engine that the 4.0 HO has a roller camshaft. Err...does it? Mine is a 1997.

[uberxj92]

wow this is a good question. i know that the "V" motors went to roolers in the HO editions. but to the best of my knowledge ( & i have been way wrong before) the jeep straight 6 didnt. however i have heard that the 97 had a different crank than the rest.

[bigjim350]

Nope. Its not a roller cam.

[uberxj92]

Nope. Its not a roller cam.

i didnt think so. was gonna pull one apart at work today for a customer & see LOL. i know that they make them at crane in Daytona beach,fl. but they are ordered & have to come with shorter push rods.

[LizardRunner]

they don't come with a roller set up but you can get it. course then you need the roller lifters, shorter push rods, locking nuts for the lifters, girdle for the same.

[gary63]

They did come out with one with roller but it didn't work out and they stopped making it. I read it was becouse the cherokee was a low cost 4x4 and it rased the price abov the target price.

[Jarlaxle]

Nope. Its not a roller cam.

:( :bang:

Well, looks like I need to stock up on high-ZDDP oil. Only have one case of high zinc 15W-40 left.

[Jarlaxle]

UPDATE! Quaker State has a new oil out, with extra ZDDP for older engines, called QS Defy.

[Mudderoy]

:( :bang:

Well, looks like I need to stock up on high-ZDDP oil. Only have one case of high zinc 15W-40 left.

Lucas 10063 Engine Break In Oil Additive with Zinc – 16 oz. (473ml)

http://ecx.images-amazon.com/images/I/41dmlTVTMIL._SL500_AA300_.jpg

I got it from Amazon for $13. Don't forget to click on our Amazon banner before buying so xjtalk gets a few cents from it!!!! :cop:

[Cheromaniac]

OK, I have searched and didn't find an answer. So, I will ask here: I assumed, being a relatively modern (1991, revised in 1996) engine that the 4.0 HO has a roller camshaft. Err...does it? Mine is a 1997.

The design of the 4.0 dates back to about 1965 when the first AMC I6 was introduced, so in engine terms it's a dinosaur and it has a hydraulic flat-tappet camshaft. You can convert the 4.0 block to run any one of the range of hydraulic roller camshafts from 505 Performance but it'll cost you over $1000.

http://www.shop.505performance.com/category.sc?categoryId=31

Their kits have everything you need including the cam itself, roller lifters, link bars, chromemoly pushrods, timing set, and valve springs with retainers and keepers.

[Jarlaxle]

Lucas 10063 Engine Break In Oil Additive with Zinc – 16 oz. (473ml)

http://ecx.images-amazon.com/images/I/41dmlTVTMIL._SL500_AA300_.jpg

I got it from Amazon for $13. Don't forget to click on our Amazon banner before buying so xjtalk gets a few cents from it!!!! :cop:

Not needed: QS Defy 10W-30, $14 for a 5-quart jug at Wal-Mart. :D

[Mudderoy]

Not needed: QS Defy 10W-30, $14 for a 5-quart jug at Wal-Mart. :D

This was the best I could find, meaning anything. I'll have to look into the WalMart stuff.

[Jarlaxle]

Got an oil analysis back from Blackstone Labs on the Defy...I'm sold. Direct quote: "Some of the best wear numbers we have ever seen from a Jeep 4 litre."