Toasted 4.2!

[Mitch]

Well I pushed it when I should have cooled it. I over heated my 88' YJ 4.2 and could'nt turn around and return down hill as quickly as I would have wanted. I now have a clatter coming from the top of my engine. This is worst from idle to 1500 rpm. I have been running hotter latey, and just had my oil pump changed to fix another problem. I'm interested in the price difference in rebuilding what I've got versus having a replacement 4.2 put in. Any help or ideas will be welcomed.

Mitch - great88 Hesperia

[KNCJeeper]

You should get that stroker 4.6L

[medicmahem]

Search the internet, here is a link from Quadfratech for rebuilt engines starting at $1500.

http://www.quadratec.com/Showcases/j...ement_engines/

[brokenujoint]

88 huh? carbed?.. yep..... 1st off i'd step away from carb and look into some fuel injection set ups.

secondly a stroked out 4.0 to a 4.6 is the ticket. dont know your time restraints, workspace or mechanical knowledge but im building a 4.6 for my 4.0 replacement and its going well

if you want a long lasting, moderately built rig for minimal money do this:

call scotty's in fontana..

go get a 96-98 4.0 block casting #53020569 (909) 829-2913 .. it cost me 250.0
also get a 91-95 4.0 head. casting number 7120 150.00

get the block mag'd, hot tanked, bore it 0.020" over, deck the head 0.010". freeze plugs and press in stock cam bearings.

use the stock 96-98 cam
stock lifters
stock valves, 3 angle valve job, polished.
port and polish the head
resurface head.
1972-80...#3214723...12 counterweights, 66lb crank cost me 100.00 in upland ca..
Crankshaft rear main seal: #05018594AA
AMC 258 rods: pn 3180444 (71-81 707 casting) with ROD BOLTS
Sealed Power 677P +0.020 pistons #STL-677P20: 122USD
Hastings +0.020 cast piston rings #667: 25USD
Clevite 77 rod bearings #CB-960P-20(6)summit for 38.00
Main bearing girdle spacer kit: (14 hardened 5/16" steel washers): 1.00
Main bearing girdle and retaining nuts: dealer 16.00
Camshaft sprocket bolt: #83502890 & washer #J3173284
Crank harmonic damper: #33002920T: 29.00
Timing gear and chain: CLO-9-3127 link to timing gear and chain 113.00
Oil pump: Melling high volume pump MEL-M167HVS from Engine Tech 818-999-3451 Richard 72.39
Engine Tech Complete Gasket set #j242L-47 Engine Tech 818-999-3451 Richard 70.84
Includes Victor Reinz lower #CS-5713X and Victor Reinz upper gasket set #HS-5713Z
Crower chromemoly hardened pushrods #70158-12: 36USD
Mopar Performance valve springs #5249464, retainers #4452032, & locks #4529218: 153USD from The Moparts Connection
Yella Terra 1.6 ratio roller rocker arms #YT6627: 364USD
THAT SHOULD GET YOU STARTED

you'll need a new computer, 99+ intake manifold and a bigger TB and mustang injectors... few other things we could talk about...

you'll have a motor for about 2500.00 completely new w/all accessories that will last you at least a decade! and will put out:
Compression Ratio: 9.25:1
Calculated flywheel outputs:
Maximum HP: 265hp @ 4900rpm
Maximum TQ: 325lbft @ 3500rpm

OR just get a SBC or a amc 360 and call it a day!

[Mitch]

Kevin,

I got dizzy just reading your list of parts. Unfortunately I do not have the skills or knowledge to do this myself. I will have to find a shop or someone to drop a new engine in. I had checked with a shop months ago about a smog legal 4.0 replacement, but they were talking $5,400 and 5 weeks of shop time. I would prefere something a little cheaper. The extra horsepower would be nice, but fuel injection would be a huge relief. The carb issue is part of my concern of harder trails. Thank you for everyones help. Keep any suggestions coming, and I'll post details to what I end up doing.

Mitch - great88 (was great)

[KNCJeeper]

http://www.quadratec.com/products/51107_50X_PG.htm


I dunno know...maybe someone could help you swap this in? Its cheaper then 5600. Wish I lived out there I would help...i need to learn about engines

[paulhead]

If you look around on some other sites (jeepaholics had a bunch of them once) or some junkyards you'll find a 4.0 for around $3-600. But you got to replace some of the wiring and computer. As far as skills make some jeep friends that drink beer and they'll put it in for you. :wrench::geek:

[brokenujoint]

yeah you could just call scotty's and get a complete 97-98 motor that is obdII, get a computer ( i think i have one i could sell... maybe) get a wiring harness ( the wiring is the hardest part probably), you may need a newer gas tank and sending unit and fuel lines and throw it all in..


also you could just have your engine rebuilt and keep what you have. i had a 92 yj carbed and i HATED IT!

[Mitch]

My local repair shop in Hesperia has a call into "Scotty's". They have a 4.0 and are putting together a price for motor, wiring harness, computer, and fuel tank. Install will be around $1000. The shop also called a company that sells rebuilt engines (not ATK) and they quoted $3200 for a 4.2 with an upgraded cam and install kit (hoses, belts, tune up stuff, etc.). Obviously if the price is similar I'll go with the injected 4.0 . But it's alot of money that I didn't plan to spend!

Don't forget, when the motor gets hot, go home so you can wheel another day.

Mitch

[paulhead]

Don't forget, when the motor gets hot, go home so you can wheel another day.

Mitch

When the motor gets hot, pull over imediately and turn it off!!

[Mitch]

Paul,

Totally correct! Unfortunatly I was on a single lane, dirt road going up hill and could not pull off or turn around as soon as I should have. I did stop for 20 minutes to let it cool down before putt puttin down hill towards home.

Mitch

[fun4wheelerguy]

Call me at my shop on Monday...... I will get you a good deal.

Bret

[Mitch]

Well, I ordered a 4.2 motor and a howell injection unit from "OFF ROAD WERKZ" and should be on the road soon. This is going to be installed by Ken @ thejeepguyonline.com in Hesperia. I will try to photo and document this change over for others to see. I can not thank Bret enough for his help and assistance in this purchase. If any of you need parts or help give OFF ROAD WERKZ a call.

Mitch - great88

[Danabee]

He must of been true to his word and gave you a good deal

[brokenujoint]

any updates?