Reuse Cylinder Head and Main Bearing Bolts - Defender Source
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  #1  
Old March 22nd, 2016, 02:33 PM
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Reuse Cylinder Head and Main Bearing Bolts

I am replacing head gaskets and wanted to know if I can reuse the bolts or if I should buy new bolts or studs.

Also, going to replace rear main seal and cross seals while I've got the engine out. Can I reuse the main bearing cap bolts or should i buy new bolts or studs for this as well?
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  #2  
Old March 22nd, 2016, 02:38 PM
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You should probably read the manual if you are pulling the engine apart. It answers all questions.
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Old March 22nd, 2016, 02:41 PM
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This is what the V8 Overhaul manual says about bolts:

CAUTION: Cylinder head bolts - Cylinder head bolts fitted to engines without suffix B added to serial number are not interchangeable with those fitted to engines with suffix B added to serial number.
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Old March 22nd, 2016, 02:48 PM
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Its pretty simple. If you are using the crappy steel shim head gaskets with head bolts that have washers yes you can reuse the head bolts. If you are using the way better elring or similar update composite gaskets you need to get the newer flanged stretch type head bolts. Do not use the washers with the new flanged head bolts.
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Old March 22nd, 2016, 02:48 PM
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Quote:
Originally Posted by nengelbrecht6 View Post
i am replacing head gaskets and wanted to know if i can reuse the bolts or if i should buy new bolts or studs.
nooooooooooooooooooooooooooooo....
[breath]
oooooooooooooooooooooooo!!!!!!!!!!!!!!
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Old March 22nd, 2016, 03:20 PM
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I've done it before, and I know of a few others that have as well. Its definitely not the correct way, but it works in a pinch. Don't use studs.
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Old March 22nd, 2016, 03:33 PM
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Listen to Doug.... A 3.5 would have had regular reusable head bolts.... These need to be torqued.... Later engines switched to torque to yield bolts. These are different bolts and are set by amount of angle. Different bolts, different procedures. Don't mix up the two types and methods.

Personally I'm not sure of a great reason to switch to the newer style. All of these head gasket failures were unheard of on Rover V8s until the late 90s.
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Old March 22nd, 2016, 04:47 PM
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my .02.

The std 3.5 was a low compression pig.

It wakes up when you put later heads on and use the composite gaskets. You up the compression ratio, gain larger valves, loose the problematic lower row of head bolts etc.
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Old March 22nd, 2016, 06:01 PM
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Quote:
Originally Posted by Red90 View Post

Personally I'm not sure of a great reason to switch to the newer style. All of these head gasket failures were unheard of on Rover V8s until the late 90s.
In my experience the composite gaskets just leak coolant externally, where the steel gaskets blow out completely.

Quote:
Originally Posted by Uncle Douglas View Post

It wakes up when you put later heads on and use the composite gaskets. You up the compression ratio, gain larger valves, loose the problematic lower row of head bolts etc.
But if you reuse the original heads and install the composite gasket you lower the compression.
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