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 Post subject: 1850 engine
PostPosted: Fri Dec 04, 2020 10:20 pm 
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Location: Harrow Middlesex
Been working on an 1850 engine,we had trouble getting the head off,in the end had to cut 5 studs,while cutting the studs have damaged the block face,whats the best way round this now ?

My thinking is have the block face skimmed,but that would leave the pistons sitting high,for the stag you can buy head saver shims,would they work/fit an 1850 ?

Thanks for any advice Dave
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dollyman
 Post subject: Re: 1850 engine
PostPosted: Sat Dec 05, 2020 10:37 am 
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Hi Dave, i might get shot down in flames :wink: but the last time this happened on a mates Dolly we filled all the marks with J B Weld. We then carefully rubbed it down with wet/dry with a wood block and then used a straight edge to check. We actually used the same method on the head that had a fair bit of corrosion. The gasket was fitted using hylomar, just a very thin smear. We also used new studs, nuts and bolts. That was approx 7 years and 20k miles ago and has never missed a beat. It does sound a bodge..... But if it works is it a bodge 8)

Tony.

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SprintV8
 Post subject: Re: 1850 engine
PostPosted: Sat Dec 05, 2020 11:07 am 
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It boils down to how much damage it’s done.

You could skim the block and the pistons
But that depends on how much is taken off the block and how thick the piston crowns are.

Does the 1850 and the Stag share the same bore size for the saver shim.

I wouldn’t JB weld anything near the piston liner.

Or have a saver shim made.

_________________
2009 Mini Clubman Cooper S Daily Driver.
1980 Dolomite Sprint with a touch of BLTS
Balanced Lightened and Tweaked 13B Rotary and SuperCharged.
Back in my possession 22 September 2019.
Rebuilding the Sprint time taken so far, 111Hrs@15/12/2020
212Hrs @31/12/2021
352 @ 28/11/2022
455Hrs @ 20/10/2023
480Hrs @ 14/03/2024
This is time taken at the Sprint not necessary time worked.

Working on a ratio of just 7Hrs a day not including driving to the Sprint.
That equals to 68 days that doesn’t include weekends.
Member TDC no 0471

Project 13B Sprint now back on.
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cliftyhanger
 Post subject: Re: 1850 engine
PostPosted: Sat Dec 05, 2020 11:10 am 
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There is a thick head gasket available. No idea how "extra" but may well be enough.
Just had a block decked for similar reasons, but 30thou off. Will be taking the same off the (new TR7) pistons, although I may well assemble pistons/crank, and measure to get the CR as high as possible.

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Brighton
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dollyman
 Post subject: Re: 1850 engine
PostPosted: Sat Dec 05, 2020 4:27 pm 
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The reason for doing my pals car the way we did it, was lack of money. Plus it saved it going to the knacker yard. :D

Tony.

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 Post subject: Re: 1850 engine
PostPosted: Sun Dec 06, 2020 12:46 pm 
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Location: Harrow Middlesex
Quote:
It boils down to how much damage it’s done.

You could skim the block and the pistons
But that depends on how much is taken off the block and how thick the piston crowns are.

Does the 1850 and the Stag share the same bore size for the saver shim.

I wouldn’t JB weld anything near the piston liner.

Or have a saver shim made.
Not sure if stag and dolomite same the same bore size for the saver shim,id have to measure

thanks Dave
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new to this
 Post subject: Re: 1850 engine
PostPosted: Sun Dec 06, 2020 12:50 pm 
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Joined: Mon Dec 12, 2016 9:53 pm
Posts: 1709
Location: Harrow Middlesex
Quote:
Hi Dave, i might get shot down in flames :wink: but the last time this happened on a mates Dolly we filled all the marks with J B Weld. We then carefully rubbed it down with wet/dry with a wood block and then used a straight edge to check. We actually used the same method on the head that had a fair bit of corrosion. The gasket was fitted using hylomar, just a very thin smear. We also used new studs, nuts and bolts. That was approx 7 years and 20k miles ago and has never missed a beat. It does sound a bodge..... But if it works is it a bodge 8)

Tony.
Didnt know JB weld would stick and last on the engine ,hadnt thought of that

Thanks Dave
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new to this
 Post subject: Re: 1850 engine
PostPosted: Sun Dec 06, 2020 12:52 pm 
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Joined: Mon Dec 12, 2016 9:53 pm
Posts: 1709
Location: Harrow Middlesex
Quote:
There is a thick head gasket available. No idea how "extra" but may well be enough.
Just had a block decked for similar reasons, but 30thou off. Will be taking the same off the (new TR7) pistons, although I may well assemble pistons/crank, and measure to get the CR as high as possible.
How would you measure to see how deep the cuts are ?

Dave
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SprintV8
 Post subject: Re: 1850 engine
PostPosted: Sun Dec 06, 2020 1:31 pm 
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Joined: Wed Oct 04, 2006 9:49 pm
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Location: Sutton,Surrey.
Straight edge and plasticine.

Plasticine in the cut
Straight edge over the top.
Carefully remove Plasticine and measure.

Photos would help.

_________________
2009 Mini Clubman Cooper S Daily Driver.
1980 Dolomite Sprint with a touch of BLTS
Balanced Lightened and Tweaked 13B Rotary and SuperCharged.
Back in my possession 22 September 2019.
Rebuilding the Sprint time taken so far, 111Hrs@15/12/2020
212Hrs @31/12/2021
352 @ 28/11/2022
455Hrs @ 20/10/2023
480Hrs @ 14/03/2024
This is time taken at the Sprint not necessary time worked.

Working on a ratio of just 7Hrs a day not including driving to the Sprint.
That equals to 68 days that doesn’t include weekends.
Member TDC no 0471

Project 13B Sprint now back on.
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