bad valve guides symptoms

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Dec 8, 2012 | 07:12 AM

#16

5-90

CF Veteran

Joined: May 2008

Posts: 3,018

Likes: 23

Year: 1988

Model: Cherokee

Engine: AMC242

Quote:

Originally Posted by Willys55

in many cases you can just knurl them and be back up and running

True - although it does depend on how much wear we're dealing with, and the pattern of wear.

Dec 8, 2012 | 08:07 AM

#17

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,579

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by Willys55

in many cases you can just knurl them and be back up and running

Correct. It seems the 4.0 isn't particularly rough on valve guides for some reason.
Valve seals? Yes, they can be rough on those. There was a TSB on the earlier models to replace them under warranty.

Dec 8, 2012 | 10:41 AM

#18

belvedere

CF Veteran

Joined: Jul 2012

Posts: 1,395

Likes: 1

From: SD

Year: 1998

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by cruiser54

Thanks for clarifying that, belvedere. I mistakenly assumed he was working on his heater blower now.

Well, maybe I'm mistaken. Maybe he is talking about the blower motor.

Guess we'll have to wait for the OP to clear it up.

Dec 8, 2012 | 12:01 PM

#19

pmichel

Junior Member

Joined: Oct 2010

Posts: 72

Likes: 0

From: NW Oregon

Year: 1993

Model: Cherokee

Engine: 4.0 HO

Quote:

Originally Posted by pmichel

If it's only valve guides it will smoke at idle but run clean at speed. Blue smoke at speed is usually rings. White smoke at any speed is usually coolant.

Valve guides can be replaced by themselves without removing the head.

Sorry guys (Cruiser is right) - I meant valve SEALS can be replaced. I did it on my smoking at idle 93 XJ at 277k. It stopped smoking and passed Oregon emissions. Here it's an automatic fail if there's any hint of smoke at the tailpipe.

Anyway, sorry for the typo boys...

Dec 8, 2012 | 12:16 PM

#20

F1Addict

CF Veteran

Joined: Nov 2011

Posts: 2,381

Likes: 6

From: SoCal

Year: 1989

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by anothadayridin

Smoking... I know its burning oil n needs lower bearings.

Quote:

Originally Posted by anothadayridin

Yep I did replaced [b]lower bearings. Sounds fine now to the smoking so stsu

So between post #1 and post #8 you replaced your rod bearings? After weeks of going back and forth on this you just... did it? Just like that? Hmmm, why don't I believe you? Oh! That's right. I know why

Dec 9, 2012 | 03:29 AM

#21

anothadayridin

Thread Starter

Senior Member

Joined: Jan 2012

Posts: 1,001

Likes: 0

From: Memphis tenn

Year: 88

Model: Cherokee

Engine: i6 4.0

Quote:

Originally Posted by belvedere

Is this an OEM blower or aftermarket (Paxton, etc)? Actually, with new bearings, the blower may now be putting out more boost, which could further stress an already-worn engine.

OK dixface

Dec 9, 2012 | 03:30 AM

#22

anothadayridin

Thread Starter

Senior Member

Joined: Jan 2012

Posts: 1,001

Likes: 0

From: Memphis tenn

Year: 88

Model: Cherokee

Engine: i6 4.0

Quote:

Originally Posted by 5-90

Correct. In fact, you have to machine the head if the valve guides are worn - since the guides on the 6-242 head are integral. Gotta bore the head out to accept press-in bronze guides...

Thanks 5-90

Dec 9, 2012 | 03:30 AM

#23

anothadayridin

Thread Starter

Senior Member

Joined: Jan 2012

Posts: 1,001

Likes: 0

From: Memphis tenn

Year: 88

Model: Cherokee

Engine: i6 4.0

Unless u have advice instead of trying to trash people that aint got it made go blow Urself

Dec 9, 2012 | 03:32 AM

#24

anothadayridin

Thread Starter

Senior Member

Joined: Jan 2012

Posts: 1,001

Likes: 0

From: Memphis tenn

Year: 88

Model: Cherokee

Engine: i6 4.0

Quote:

Originally Posted by F1Addict

There are few if any more knowledgeable on Renix Jeeps than Cruiser and while there are some guru's here, no one (<<TWO words) takes the time to help folks out like he does so for you to disregard his input is just one more indication of what a troll you are. Just sayin'. Go ahead, Sunshine, call me a ****tard again, I obviously don't care.

Hey. Slu7box go play hide the sausage. And be nice