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Old 02-26-2004, 10:27 PM   #1
CRF230Rider
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Replacing intake manifold gaskets on a 98 Silverado

Has anyone here replaced the intake maifold gaskets on a 98 or similar model Chevy/GMC truck? Mine has a 5.0 or 305 motor that is leaking coolant badly at the back of the cylinder head at the intake manifold. Everything I've read says to change the manifold gaskets so I guess that's what I'm in for. How long will the job take for average shade tree mechanic, 8 hours?
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Old 02-27-2004, 01:38 AM   #2
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8 hours, I would hope not, geez. It took me about 2.5 hours and I wasn't really in a big hurry. I do work with these trucks a lot though.
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Old 02-27-2004, 08:53 AM   #3
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If you've never done it before, leaving yourself a full day (8 hours) isn't a bad idea. Especially on the newer vehicles, there are a LOT of wires up top.

Take your time as you disconnect things. Either take digital pics as you go or use tape and a sharpie to mark wires and hoses as you disconnect. TRUST ME, every minute spent documenting will save you an hour of puzzling over wires and hoses as you put it together.

Although leaving yourself a full day is a good idea, I'd guess if you're careful and good with wrenches, you'll be done in time for an early Beer O' Victory!

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Old 02-27-2004, 01:53 PM   #4
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Angry Me To

Looks like I'm going in that direction too seen a small spot of coolant on the garage floor yesterday.
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Old 03-03-2004, 12:16 PM   #5
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There must have been something defective about these gaskets from day one.
My intake manifold gasket went out when the truck had less than 50K on it. Right in the back on the left bank head.
It took my buddy about 3 hours and he was a licensed GM mechanic at one point. He said he had never seen a gasket do what mine did and he felt it was probably defective to begin with.
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Old 03-04-2004, 12:31 PM   #6
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i have alot of friends who are mechanics, and it seems intake manifold gasket failure is very common, in all vehicles, soom think its something with the newer long life coolant, anyone else hear that?
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Old 03-04-2004, 12:46 PM   #7
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Yep...i forgot to add that to my last post. I've been told that the dex cool crap is damaging the gaskets as well as slowly eating away at the freeze plugs.
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Old 03-04-2004, 03:48 PM   #8
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couple shops that i know of are flushing cooling system and installing the green antifreeze after replacing intake manifold gaskets, oh yea and don't ever mix the two together, it'll turn brown, and i heard the two mixed break each other down so that the lubricating value for water pump won't be there
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Old 03-04-2004, 03:56 PM   #9
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gm and ford also say do not use the 3m roloc fiber pads on a angle die grinder to remove gasket material on aluminum surface, ford says use plastic gasket scraper, gm says you can use die grinder with white roloc bristle disc,120 grit
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Old 03-04-2004, 06:47 PM   #10
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I've never had a problem with the intake gaskets on one of these trucks. I had to change the intake cause of one of those stinking water fittings.
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Old 03-15-2004, 08:32 AM   #11
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This problem is due to the fact that these gaskets are overtorqued from the factory. To date I have done about 8 of these.
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Old 03-15-2004, 09:43 AM   #12
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Watch out for the water fitting on the intake, you will probably end up breaking the nice little plastic piece that holds it in there, you just as well go down and buy a new fitting at NAPA before you get started (8-9.00). The wires and everything look intimidating, there is really nothing to it, the wires will only plug into one fitting so you can't screw it up that way. Make sure you get the distributor marked and back in right. I used carb cleaner to clean the intake off inside and out and it cleaned up like new with no scrubbing, took about 10 cans though.

Good Luck, I tied up most of a weekend but I took my sweet time and cleaned everything up real good.
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Old 03-15-2004, 12:46 PM   #13
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YOU KNOW CHEVY IS GOING DOWN HILL IT LIKE MY PAINT ONE DAY JUST STARTED TO FALL OFF, I THINK GM SHOULD BE MADE FIX BAD PARTS AND PAINT, I KNOW I WONT BUY ANOTHER CHEVY
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Old 03-15-2004, 07:31 PM   #14
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And no other brand ever has a parts problem???
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Old 03-16-2004, 08:25 AM   #15
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Quote:
Originally posted by jsledder
And no other brand ever has a parts problem???
No kidding! My neighbor's Fords are constantly giving him problems. One thing after the other.
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Old 03-16-2004, 08:34 PM   #16
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The intake gaskets on mine were plastic and had an o-ring embedded in them for the seal. The mechanic was suprised to see that they made it that long (70000). The new ones are the same and he blamed it on the gaskets themselves, the plastic gets harder and ridgid from the constant warm up and cool down and eventually breaks (he said 99% of them in the same spot on the back passenger side). Usually it shows up in the winter around here. Good luck they had mine for a day.
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Old 03-20-2004, 01:46 PM   #17
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Quote:
Originally posted by bwood
The intake gaskets on mine were plastic and had an o-ring embedded in them for the seal. The mechanic was suprised to see that they made it that long (70000). The new ones are the same and he blamed it on the gaskets themselves, the plastic gets harder and ridgid from the constant warm up and cool down and eventually breaks (he said 99% of them in the same spot on the back passenger side). Usually it shows up in the winter around here. Good luck they had mine for a day.
Just out of curiosity, did you have a dealer work on it? If you don't mind me asking what did they charge?
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Old 03-20-2004, 05:04 PM   #18
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I had the dealer work on it, it has an extended warranty through GM so it only cost me $50. I did ask though, they said between $600-$700. After I woke back up (from the shock) they told me it was an all day job. A local mech told me he normally does this for around $350 - $450 including replacing the nipple in the intake.
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Last edited by bwood; 03-20-2004 at 11:31 PM.
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Old 03-21-2004, 09:25 PM   #19
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DO NOT USE PARTS STORE GASKETS! use genuine GM gaskets, they're thicker and will seal better than anything out there.
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Old 03-22-2004, 12:33 AM   #20
97silv5.7
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Wondering how long do those gaskets last? my 97 has 51k on it and its still nice and clean. Just wonderin so ill be prepared. Thanks
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Old 03-23-2004, 09:50 PM   #21
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Good question '97. My '96 just turned over 100k and it sounds like I'm one of the fortunate ones. Good luck with yours.
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