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Old 04-05-2006, 11:36 PM   #3
Benesesso
3" Exhaust
 
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Location: Phoenix, AZ
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I've done a bunch of searching and couldn't find any good answers. The 1990 Supra I recently bought only had 65k miles, and it ran fine for several months. The previous owner said he had retorqued the head bolts ~40k miles, and I believe him. At ~72k miles the HG started leaking slightly into cyl. 6 and a tiny bit into #2. Pulled the head off right away-no heat damage. The head bolts were right ~70 ft. lb.


So, I think I had a case of some previous HG damage from the orig. low torque, but retorquing did not prevent the BHG.

Since it appears that the Mark IV's don't usually have the problem, I just wondered what Toyota did differently. Looks like they kept the same 14 bolts but raised the torque--and maybe used a better HG.
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1988 and 1990 Turbo Supras
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