J70TLCD Head gasket removal replace

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crazyjackcsa

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Sep 19, 2013
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1986 Johnson 70hp J70TLCD.

Head gaskets went bad. What's the bolt pattern and torque specs?

Also, what would cause it? They just seemed to go bad all of a sudden. Cruising along all find and jim dandy and then poof!

TT
 
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boobie

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Nov 5, 2009
Messages
20,826
Re: J70TLCD Head gasket removal replace

18-20 ft lbs. Start in the center and work your way out in a spiral pattern. Maybe not torqued properly from the start caused it to blow.
 
Last edited:
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crazyjackcsa

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Sep 19, 2013
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Re: J70TLCD Head gasket removal replace

The head has numbers on it, for each of the studs. You're telling me not to follow the numbers? Why would those numbers be there?
 
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boobie

Supreme Mariner
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Re: J70TLCD Head gasket removal replace

Well then, follow the numbers on it. No big deal. A lot of heads don't have numbers.
 
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schematic

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Re: J70TLCD Head gasket removal replace

crazyjackcsa said:
1986 Johnson 70hp J70TLCD.


Also, what would cause it? They just seemed to go bad all of a sudden. Cruising along all find and jim dandy and then poof!

TT
Click to expand...

Engine could have been overheated at some point in time. This results in loose head bolt torque which results in "blown gasket"
 
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