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08-17-2008
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#1 |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,686
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IH gasket coolant leak w Pics
For the past several weeks I was noticing a bit of white smoke coming from the exhaust. It went away once the motor was warmed up and I had
attributed it to the new MagnaFlow I had installed. But there was a bit of a coolant smell tho. However, I did a WOT run and then the smoke really came out. SO, off came the plenum. =Jeff= and I did a coolant pressure test as recommended by Ccmano and karterdon, and we saw coolant dropping into the #4 primary runner coming from between the cylinder head and the IH. I had used .030" gaskets when I did the P&P this winter. I think that's too thin to hold up. Now replaced with .060" from FlatOut Racing. Motor runs much stronger when firing 8 cylinders.  While I was at it I blocked off coolant passages at the IH/Plenum interface Pics below:     
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08-17-2008
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#2 |
 
Join Date: Nov 2006
Location: dayton,ohio
Posts: 424
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Re: IH gasket coolant leak w Pics
Good to know! Mine has had the same gasket from FO since March with no trouble. Installed mine dry this time.
The ones I've taken apart seem the bolts could use a retorque. Was planning on checking torque of the IH this fall. |
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08-17-2008
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#3 | |
Join Date: May 2005
Location: Leesburg, VA
Posts: 2,704
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Re: IH gasket coolant leak w Pics
Quote:
Was the I/H to head gasket a GM one? |
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08-17-2008
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#4 | |
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Guest
Posts: n/a
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Re: IH gasket coolant leak w Pics
Quote:
He might be talking about HOTB Issue #10, Apr 07 that Locobob wrote. Great article and I followed step by step to do mine too. 
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08-17-2008
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#5 | |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,686
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Re: IH gasket coolant leak w Pics
Quote:
Sorry didn't take pics, but its the IH coolant passage that mates with the plenum passage to the TB. Found on either side between primary #4 and secondary #2, primary #3 and secondary #1 runners. I used a 1/8 NPT countersink socket head plug. Drilled out existing hole with 21/64" bit, then tapped with 1/8 NPT tap. Got all at ACE hardware. I put a bleeder valve on the passenger side coolant tube using the same bit and tap. The I/H gasket I used were from Flatout Racing. Only this time I used a .060" rather than a .030". |
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08-17-2008
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#6 |
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Join Date: Dec 2007
Location: Bloomingdale, Il
Posts: 330
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Re: IH gasket coolant leak w Pics
How come whenever something odd happens -=jeff=- name is always close at hand??????
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08-17-2008
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#7 |
 
Join Date: Dec 2003
Location: S. Florida
Posts: 2,647
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Re: IH gasket coolant leak w Pics
Informative Thread
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08-17-2008
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#8 | |
 
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,165
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Re: IH gasket coolant leak w Pics
Quote:
__________________
1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Shelby Series 1 - Wilwood Brakes Custom Interior NCM Lifetime Member #978 |
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08-17-2008
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#9 |
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Guest
Posts: n/a
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Re: IH gasket coolant leak w Pics
Psst, I told you to pull the injector housing
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08-18-2008
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#10 | |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,686
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Re: IH gasket coolant leak w Pics
Quote:
 I am not worthy.
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