Stripped threads 4.0 head
I have been rebuilding a 4.0 engine from a 1996 Range Rover. I have been having some head gasket problems, and yesterday while installing the bolts, two of the long bolts stripped out the threads from the block.
My question is, what is the accepted way to repair this? I have read elsewhere that some use double helicoils, while others use something called Timesert. These look promising, but the kit for a Rover engine is, frankly, outrageously priced for a one time effort. I have also read that helicoils can "back out" over time. Anyone had any trouble with this? |
RDMG Dave R Northern Virginia (138 posts) Registered: 04/07/2016 08:29PM Main British Car: 1979 MGB 4.6L Rover V8 |
Re: Stripped threads 4.0 head
You can save some money on TimeSerts by buying the pieces separately. As far as I can tell, the only benefit of the Rover-specific kit is a jig to help you maintain alignment while drilling and threading the holes. There’s probably a harbor-freight gizmo that will do the same thing for far less $.
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britcars Phil Ossinger New Brunswick, Canada (346 posts) Registered: 02/02/2009 07:58PM Main British Car: 1977 MGB Roadster, Rover 3.5 ADVENTURE BEFORE DEMENTIA! |
Re: Stripped threads 4.0 head
What Ed said........................Timeserts are the way to go. I use them all the time to repair rover blocks. Get rid of the stretch bolts and use ARP studs.
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Re: Stripped threads 4.0 head
I made a jig for installing thread inserts square to deck on engine blocks. With simple adapters, works great for drilling and tapping square to surface on many places. Anyone with a mill can make a similar one. If you like, I can probably send some pictures.
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BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6468 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: Stripped threads 4.0 head
I did that too. Inserted double helicoils, and still had issues with pulling the threads out of the block. Eventually went to an iron block and that took care of it.
Jim |
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