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blown head gasket :eek: #745668
February 26th 2019 5:26 am
February 26th 2019 5:26 am
Joined: Apr 2004
Posts: 1,749
Ireland
shaggy Offline OP
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shaggy  Offline OP
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I'm gonna be replacing head gaskets soon. Is it best practice to replace the inlet manifold bolts as well as the head bolts or should they be fine to re-use?


79 chevy G30 cobra camper conversion.
[Linked Image]
Re: blown head gasket :eek: [Re: shaggy] #745747
February 28th 2019 9:32 am
February 28th 2019 9:32 am
Joined: Feb 2019
Posts: 29
Lawrence, KS USA
M
Marcela Offline
newbie
Marcela  Offline
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Lawrence, KS USA
I'm assuming you have a leaking head gasket?

Sometimes you can fix those without removing the head.

If the head bolts are not the one and done type, i.e. reuseable you can start at the center and using the pattern recommended retorque each one, one at a time. Believe the chevy head bolts go through into the water jacket so you'll have to drain the coolant and pull the bolt and put sealer on it. But do one at a time. Take it up to 20-23 lbs and then one swing of the torque wrench take it to the full value, has to be one swing, don't stop. Do each one this way then do a pressure test on the cooling system to see if it is fixed.

I've done this and saves mucho time and works.

If yours is the '79 vintage they should be reusable. If you change to studs you might have better luck on the above method.

Re: blown head gasket :eek: [Re: Marcela] #745752
February 28th 2019 10:48 am
February 28th 2019 10:48 am
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Ireland
shaggy Offline OP
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shaggy  Offline OP
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Thanks Marcela,

I’ll give that a go.

Just want to clarify this bit
Quote
” If you change to studs you might have better luck on the above method. “


I presume you mean head bolts rather than studs.
Or do you mean switch the bolts for studs?

I have bought a new set of head bolts so will use them one at a time with sealer and re-torque as you’ve suggested.

Cheer’s for the reply.


79 chevy G30 cobra camper conversion.
[Linked Image]
Re: blown head gasket :eek: [Re: shaggy] #745754
February 28th 2019 11:50 am
February 28th 2019 11:50 am
Joined: Feb 2019
Posts: 29
Lawrence, KS USA
M
Marcela Offline
newbie
Marcela  Offline
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Joined: Feb 2019
Posts: 29
Lawrence, KS USA
Bolts work fine. Studs can work better, better clamping. But bolts will work fine for what you are doing. Let us know how it turns out.

Re: blown head gasket :eek: [Re: shaggy] #745759
February 28th 2019 3:34 pm
February 28th 2019 3:34 pm
Joined: Apr 2004
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Ireland
shaggy Offline OP
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shaggy  Offline OP
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Cool I'll try it with the bolts I have. I'm hopeful as it doesn't seem like too much water is getting in the oil. There's a bit of emulsion inside the filler cap but nothing too bad.


79 chevy G30 cobra camper conversion.
[Linked Image]
Re: blown head gasket :eek: [Re: shaggy] #745760
February 28th 2019 4:11 pm
February 28th 2019 4:11 pm
Joined: Sep 2005
Posts: 8,734
Georgia, USA
CatFish Offline
carpal tunnel
CatFish  Offline
carpal tunnel
Joined: Sep 2005
Posts: 8,734
Georgia, USA
Shaggy have you verified it's a head gasket and not the intake gasket? Did you find a wet spark plug or water in one of the cylinders?
Just a thought.


“A van may be safe in the garage, but that's not what vans are for.”

Re: blown head gasket :eek: [Re: shaggy] #745890
March 03rd 2019 5:11 pm
March 03rd 2019 5:11 pm
Joined: Apr 2004
Posts: 1,749
Ireland
shaggy Offline OP
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shaggy  Offline OP
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Posts: 1,749
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Hi Catfish, No I haven't started into it yet. I'll do a compression test , check the plugs and I can probably get a loan of a cheap borescope too.


79 chevy G30 cobra camper conversion.
[Linked Image]
Re: blown head gasket :eek: [Re: shaggy] #745892
March 03rd 2019 5:31 pm
March 03rd 2019 5:31 pm
Joined: Feb 2019
Posts: 29
Lawrence, KS USA
M
Marcela Offline
newbie
Marcela  Offline
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M
Joined: Feb 2019
Posts: 29
Lawrence, KS USA
I'd do a pressure test of the cooling system or bypass that if not needed. A leak down test over a compression test is what i prefer.

Re: blown head gasket :eek: [Re: Marcela] #745907
March 03rd 2019 9:47 pm
March 03rd 2019 9:47 pm
Joined: Sep 2005
Posts: 8,734
Georgia, USA
CatFish Offline
carpal tunnel
CatFish  Offline
carpal tunnel
Joined: Sep 2005
Posts: 8,734
Georgia, USA

Pressurize the cooling and look for water or signs of moisture in the cylinders. It may save you some headaches if (fingers crossed) there's none there. I've had intake gaskets leak water before and it's very disturbing to see it happening to do leanbh!

Last edited by CatFish; March 03rd 2019 10:15 pm.

“A van may be safe in the garage, but that's not what vans are for.”

Re: blown head gasket :eek: [Re: shaggy] #745917
March 04th 2019 8:37 am
March 04th 2019 8:37 am
Joined: Apr 2004
Posts: 1,749
Ireland
shaggy Offline OP
veteran
shaggy  Offline OP
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Joined: Apr 2004
Posts: 1,749
Ireland
"To do leanbh" . You speak Irish Catfish? smile


79 chevy G30 cobra camper conversion.
[Linked Image]
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