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Unread 07-30-2007, 08:07 AM   #1
johnboy2007
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engine removal to get at head gasket

Hi there,

I have a 1998 (4.0l) GC with a blown head gasket. In order to remove the head gasket do you have to remove the engine. It would appear the bulk head is preventing the removal of the rocker cover. Any ideas.

Many thanks

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Unread 07-30-2007, 08:13 AM   #2
ajmorell
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Uhh no way. The head is straight on top of the engine, why would you need to remove the entire engine? All you really need to do is disconnect everything from the head (throttle body, intake, exhaust, etc) and pull it off.
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Unread 07-30-2007, 08:43 AM   #3
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changing the headgasket on a 4.0 is like changing a diaper...everything is disconnect, lift off, clean up put a new gasket on, and reconnect
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Unread 07-30-2007, 08:45 AM   #4
ajmorell
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Quote:
Originally Posted by BNB
changing the headgasket on a 4.0 is like changing a diaper...everything is disconnect, lift off, clean up put a new gasket on, and reconnect

Yup, probably a good days worth of work if you haven't done it before. It takes ~2-3 hours to get the manifolds off and everything else disconnected for a first timer, probably an hour for a seasoned vet.
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Unread 07-30-2007, 08:47 AM   #5
BNB
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Quote:
Originally Posted by ajmorell
Yup, probably a good days worth of work if you haven't done it before. It takes ~2-3 hours to get the manifolds off and everything else disconnected for a first timer, probably an hour for a seasoned vet.

an hour? damn boy you must be moving at snails pace...unless of course you are doing the normal method of..

Beer
wrench
beer
wrench
etc..

haha
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Unread 07-30-2007, 08:53 AM   #6
ajmorell
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Quote:
Originally Posted by BNB
an hour? damn boy you must be moving at snails pace...unless of course you are doing the normal method of..

Beer
wrench
beer
wrench
etc..

haha

I do like that method but I was speaking from experience. I have only had to tear that apart 1 time to do my exhaust manifold and it took me a good 4 1/2 hrs or so to get it done. Next time I could probably get it done in 3 hrs or so, but it's all part of the learning experience.
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Unread 07-30-2007, 09:00 AM   #7
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Quote:
Originally Posted by ajmorell
I do like that method but I was speaking from experience. I have only had to tear that apart 1 time to do my exhaust manifold and it took me a good 4 1/2 hrs or so to get it done. Next time I could probably get it done in 3 hrs or so, but it's all part of the learning experience.

gotta learn somewhere...and air tools help too
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Unread 07-30-2007, 09:03 AM   #8
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Quote:
Originally Posted by BNB
gotta learn somewhere...and air tools help too
Better be careful with air tools around such things. Broken threads are very time consuming to fix :-(
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Unread 07-30-2007, 09:05 AM   #9
ajmorell
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Quote:
Originally Posted by BNB
gotta learn somewhere...and air tools help too

They do, but not really with replacing the head gasket since there really isn't anything you can use an impact on (the only thing I can see using is an air ratchet).
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Unread 07-30-2007, 09:08 AM   #10
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Quote:
Originally Posted by ajmorell
They do, but not really with replacing the head gasket since there really isn't anything you can use an impact on (the only thing I can see using is an air ratchet).
i was talking in general...
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Unread 07-30-2007, 09:13 AM   #11
ajmorell
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Quote:
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i was talking in general...

I agree 100 times over, but we are killing this guy's thread so no more chit-chat.
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Unread 07-30-2007, 09:16 AM   #12
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back to post at hand..

just got snag a Chiltons or Haynes manual..it explains in detail and pictures on how to do this..good luck!
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Unread 07-30-2007, 11:33 AM   #13
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Johnboy,

No, you shouldn't need to remove the engine to change the head gasket.

In order to get the valve cover off you will probably need to remove the plastic vacuum connector nearest to the cowl. It is probably a good idea to buy a new one since that one is going to be brittle and will likely break apart. Once that connector is out you should be able to lift and twist the cover off.

Head bolts are reusable once and if they have already been reused there should be a dab of bright paint on them to indicate such. If you are in doubt, buy a new set of bolts. Watch the torque pattern and spec; they are not all the same.

This will be a good time to check your exhaust manifold for cracks and to change that gasket as well.

Good luck!

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Unread 07-30-2007, 11:36 AM   #14
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also, while you have the head off, I would deffinately change the timing chain.
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Unread 07-31-2007, 12:44 PM   #15
johnboy2007
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thanks for the replies everyone.

I've managed to track down a manual via ebay, and will give it a go once I,ve read it.

I have noticed you need a special tool to remove head bolts as these have splines on them. Since I'm based in the uk, most auto shops do not stock GC parts. Anyone know where I can locate this specialist tool?
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