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Old 05-13-2011, 08:29 AM   #1
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Replacing head gasket

I am about to start ripping into my engine to replace the head gasket and was wondering if there is anything else I should be replacing or looking at while Im in there. I have a v6 2002 sport and it is burning coolant. I also notice a lack of oil pressure once it is warmed up and a clicking sound at idle (i think its a lifter). Any recomendations?

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Old 05-13-2011, 04:28 PM   #2
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Umm, how long and how bad was it?
IF it was bad, and you ran it a while, you could have scored the bearings. Would show as low oil pressure once it warms up, as the oil thins, and a bearing (rod) can make a ticking noise at first. If it's a rod bearing it will increase in noise and amount if you rev the engine in neutral. Usually a sharper rap noise then a lifter tick.

Mains will show up with the engine accelerated, in gear, and brake applied.

Coolant will wash the bearings of oil and then they score.

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Old 05-13-2011, 04:49 PM   #3
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Quote:
Originally Posted by Shelby427 View Post
Umm, how long and how bad was it?
IF it was bad, and you ran it a while, you could have scored the bearings. Would show as low oil pressure once it warms up, as the oil thins, and a bearing (rod) can make a ticking noise at first. If it's a rod bearing it will increase in noise and amount if you rev the engine in neutral. Usually a sharper rap noise then a lifter tick.

Mains will show up with the engine accelerated, in gear, and brake applied.

Coolant will wash the bearings of oil and then they score.
sounds familiar. my 89 300 I6 just started knocking and i had to shoot it. it had very near to 300k miles.

anchisis: this is one rare time i would add some lucas oil treatment while i tried to figure out the problem. on my 300 it bought me some time while i diagnosed it. also changing the oil with some heavier weight will disguise the problem for a little while. how many miles do you have by the way? you may need to start saving for a motor rebuild if you don't want to play the endless game of "chase the engine problem."
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Old 05-13-2011, 11:29 PM   #4
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Quote:
Originally Posted by Anchisis View Post
I am about to start ripping into my engine to replace the head gasket and was wondering if there is anything else I should be replacing or looking at while Im in there. I have a v6 2002 sport and it is burning coolant. I also notice a lack of oil pressure once it is warmed up and a clicking sound at idle (i think its a lifter). Any recomendations?
V6? Should be a straight 6 unless some motor swapping was done. When you check the oil does it look all milky colored? If so you have an internal gasket leak or crack. If the oil is fine and you are just loosing coolant it would be an external leak. If you are taking the time to do the head gasket you will want to have the head checked for cracks and to see if it is warped by a machine shop. While you are at it you may as well replace the valve seals and other top end gaskets as they all come in the set.
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Old 05-14-2011, 08:35 AM   #5
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Sorry about that, it is a straight 6. Oil is clean. I have only 86,000 miles. It has been going through coolant for about 3 years now. I go through a jug of coolant every month. I have had it looked over numerous times by a few different shops as well as myself and cannot find any external leaks. I can smell it burning. Thought changing the gasket and machining the head would be the nest logical step. As for the ticking sound, it comes and goes. I already tried the thicker oil to no avail. Actually that seemed to worsen the problem. Now if I dont put thicker oil in the pressure is non existant. Maybe an oil pump? Sometimes when I rev it in nuteral the ticking speeds up and then dissapears altogether.
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Old 05-14-2011, 09:24 AM   #6
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Originally Posted by Anchisis View Post
Sorry about that, it is a straight 6. Oil is clean. I have only 86,000 miles. It has been going through coolant for about 3 years now. I go through a jug of coolant every month. I have had it looked over numerous times by a few different shops as well as myself and cannot find any external leaks. I can smell it burning. Thought changing the gasket and machining the head would be the nest logical step. As for the ticking sound, it comes and goes. I already tried the thicker oil to no avail. Actually that seemed to worsen the problem. Now if I dont put thicker oil in the pressure is non existant. Maybe an oil pump? Sometimes when I rev it in nuteral the ticking speeds up and then dissapears altogether.
Did anyone ever do a pressure test of the cooling system? Sometimes that will show you leaks you never knew were there.
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Old 05-14-2011, 10:44 AM   #7
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pressure tested and passed
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Old 05-14-2011, 10:53 AM   #8
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If it pressure tested and passed then I would say it is not your head gasket, but it is leaking somewhere else.

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