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jaygerding
john gerding

(20 posts)

Registered:
06/14/2017 09:33PM

Main British Car:


Stripped threads 4.0 head
Posted by: jaygerding
Date: February 03, 2019 01:45PM

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?


Special
ED TESTA

(7 posts)

Registered:
04/24/2019 09:58PM

Main British Car:


Re: Stripped threads 4.0 head
Posted by: Special
Date: May 29, 2019 11:03PM

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.


RDMG
Dave R
Northern Virginia
(122 posts)

Registered:
04/07/2016 08:29PM

Main British Car:
1979 MGB 4.6L Rover V8

Re: Stripped threads 4.0 head
Posted by: RDMG
Date: June 10, 2019 01:36AM

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 $.


britcars
Phil Ossinger
New Brunswick, Canada
(332 posts)

Registered:
02/02/2009 07:58PM

Main British Car:
1977 MGB Roadster, Rover 3.5 ADVENTURE BEFORE DEMENTIA!

authors avatar
Re: Stripped threads 4.0 head
Posted by: britcars
Date: June 10, 2019 07:47AM

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.


quietone
Larry Mimbs
Tennille, Ga.
(92 posts)

Registered:
07/13/2013 04:22PM

Main British Car:


Re: Stripped threads 4.0 head
Posted by: quietone
Date: June 10, 2019 03:20PM

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.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5829 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Stripped threads 4.0 head
Posted by: BlownMGB-V8
Date: June 10, 2019 05:25PM

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


Special
ED TESTA

(7 posts)

Registered:
04/24/2019 09:58PM

Main British Car:


Re: Stripped threads 4.0 head
Posted by: Special
Date: June 12, 2019 01:29AM

I have stacks of heads around my shop from rebuilding rover engines and i just have one spare that i use as a template for the drilling.



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