Topic: 2.5 engine internal year fitment

[penske2704]

i own a 1998 jeep tj 2.5 whit a tired engine 277 xxx km on it runs good no smoke but bad engine lifter noise ore piston knock. i iam regarding doing a rebuilt but i just wonder what year engine kit wil fit    i think the engine itself it the same 1983-200?    and it is just the fuel system that is changing  .. annyway i want 030 over bore and head work whit a good cam .. is annybody can lead me witch cam should i buy whit not going nuts

tanks

[Jeffy]

I would stick with a TJ block as it will have the same cam.  The AMC 2.5L goes all the way back to 1984.

[penske2704]

tanks guys
and for a cam?  were to buy    here un canada  i cant not find a place were they make them  i found on other post that hesco make one but 289 $ hish .. i still look every day on e bay if i ave some luck but nop noting there 
for now i iam going to buy a other complete 93 yj engine low miles whit all the cores and ax5 + t case np231 for 200$ here localy and go from there . i iam going to built this motor fresh then i got just to replace it when ready since it tis my daily

i love my 4 cyl at first i was not sure about buying that jeep but i dont regret it and whit a new engine a litle tweek ore two proper gears i know it is gona be a winner

[Jeffy]

Modified cams are only available from Clifford and Hesco.  That's it.

[penske2704]

connecting rod - piston - rocker arm - push rod from a 4.0  is it posible to put in a 4 cyl

[penske2704]

 please i need to know witch parts are interchangeble i could get good price on 4.0 rocker arm tanks

[sharpxmen]

connecting rod - piston - rocker arm - push rod from a 4.0  is it posible to put in a 4 cyl

4cyl 2.5L
bore=3.875''
stroke=3.1875
piston:
compression distance=1.580''
pin dia=0.931''

6cyl 4.0L
bore=3.875''
stroke=3.414
piston:
compression distance=1.585''
pin dia=0.931''

since they are different stroke the rod length will be different compared to the 4cyl/2.5L
the compression distance is also different, the piston might work with some modifications but i can't tell for sure.

i'm pretty sure the rockers and hydraulic lifters (tappets) are the same but i have no idea if the push rod is the same length, they are quite cheap new so might as well go with the correct ones.

[penske2704]

tanks allot

great to ha info like that

[Jeffy]

It's also in the FAQ: http://4bangerjp.com/forums/index.php/topic,4.html

[penske2704]

  blown engine

whent crap today going of stop light something whent wrong in there but oil pressure was good and still good after engine started to knock like hell so il drove it home 10 km and found a other 2.5 for 300 $ running in the jeep just finish pulling it out of a 1995 yj

tonight i iam gona  pull my blown one out and prep for the new one  after i will open up the blown one a see what went wrong

will keep you inform

[sharpxmen]

blown engine

whent crap today going of stop light something whent wrong in there but oil pressure was good and still good after engine started to knock like hell so il drove it home 10 km and found a other 2.5 for 300 $ running in the jeep just finish pulling it out of a 1995 yj

tonight i iam gona  pull my blown one out and prep for the new one  after i will open up the blown one a see what went wrong

will keep you inform

ouchie

good that you found a replacement, hopefully is in good shape

[dwtaylorpdx]

Clay Smith grinds the Hesco Cams....

Dave

[penske2704]

i finis up putting my new old engine and went for a litle try out  -- nice smooth reving engine but i notice it was less powerfull tan my original one
maybe because it is a 95 block and i keep the red injector insted of my gray one i might go back to my gray ones i iam sure they ave more flow

by the way i open up my blown engine a found #4 piston skirt in the oil pan   thats is what hapend  monday afternoon

[sharpxmen]

i finis up putting my new old engine and went for a litle try out  -- nice smooth reving engine but i notice it was less powerfull tan my original one
maybe because it is a 95 block and i keep the red injector insted of my gray one i might go back to my gray ones i iam sure they ave more flow

by the way i open up my blown engine a found #4 piston skirt in the oil pan   thats is what hapend  monday afternoon

'98 needs 23.2 lb/hr at 49 psi injectors, the '95 has 17.4 lb/hr at 39 psi which will only give you 19.5 lb/hr at 49 psi so you're quite short on fuel - you're way too lean so replace the injectors asap (you can damage the engine otherwise).

[penske2704]

tanks i iam gona doo that this afternoon 
i iam also waiting for a responce from clifford for a cam they are out of stock right now but probably next week they gona ave some

but 5 model to choose from  witch one should i get