Engine rebuild issue - Nissan : Datsun ZCar forum :Nissan Z Forum: 240Z to 370Z
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post #1 of 4 (permalink) Old 07-17-2019, 02:35 PM Thread Starter
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Engine rebuild issue

I have my ‘72 240 engine being overhauled as part of a total restoration. The shop has run into a snag. Despite removing all the head bolts, including some that snapped, they can’t get the head to separate from the block, despite considerable effort. We have to be careful not damage the head. Has anyone run into this situation before?
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post #2 of 4 (permalink) Old 07-17-2019, 03:52 PM
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Where did the head bolts snap? Down at the threads, or up high near the head of the bolt?
If they snapped near the head of the bolt, the rest of the bolt(s) is probably oxidized (frozen) to the cylinder head.

Larry


1976 280Z - Street

1973 240Z - SCCA Autocross F Prepared
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post #3 of 4 (permalink) Old 07-17-2019, 03:56 PM
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Quote:
Originally Posted by tudall View Post
Despite removing all the head bolts, including some that snapped,

I'm just guessing, but the shop probably used an impact wrench to disassemble the engine. A big no-no on a 47 year old motor. Especially a motor with an aluminum head.

Larry


1976 280Z - Street

1973 240Z - SCCA Autocross F Prepared

Last edited by crayzlair; 07-17-2019 at 03:59 PM. Reason: Clarification
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post #4 of 4 (permalink) Old 07-17-2019, 07:26 PM
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did they get the two little bolts that fix the head to the front cover?
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