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PostPosted: Tue Dec 27, 2016 5:15 pm 
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Anyone got any information on when BMC changed the B series pistons, as fitted to 1800 Landcrabs, from 5 to 4 rings ?

I think it was around 1971 but not sure.

Reason for asking is Dad wants to look out for a set of Std rings for his early 72 (probably built '71) 18/85 but doesn't know if it is a 4 or 5 ring piston engine until he pulls the engine apart. He has no plans to do it yet but would like to get the rings beforehand.

Engine number is 18H 305CH 7**

Cheers

Andrew


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PostPosted: Tue Dec 27, 2016 7:31 pm 
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Be a shame to by rings and then find out it was bored +20 at the factory or elsewhere?


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PostPosted: Tue Dec 27, 2016 8:19 pm 
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Granted, but we do know its history from 6 months old and the engine has never been apart in its 44,000 mile lifetime so chances are it'll be Std.

It's a gamble but worth it as the rings are a very good price. It's more whether the pistons are 4 or 5 ring being the issue.


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PostPosted: Tue Dec 27, 2016 9:37 pm 
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Andrew, I will ask my mate tomorrow for you. He has the largest collection of 1800 cars in the British Isles. In fact he has four Wolseley 18/85 Ss, two automatic and two manual. I must post up some photographs of his collection :lol:

Alan

PS my mate may have a new set of rings and pistons.


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PostPosted: Tue Dec 27, 2016 9:42 pm 
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Hi Alan,

Would love to see them. An 1800S....is it the ultimate S :shock: :?

Your friend appears to have the monopoly on Landcrabs then :lol:

Be great if you could help. I have it on authority that the change is possibly engine no. 9685, which would put our engine as the 5 ring type.

We are just thinking ahead at the moment about a possible engine overhaul but to be honest, if it were mine, I'd leave it alone as it only uses a small amount of oil (since tightening up the fuel pump bolts !) and it sounds and runs superb.

Vastly underrated cars.

Andrew


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PostPosted: Fri Jan 06, 2017 11:23 am 
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Hello Andrew, sorry for the delay in getting back to you. We all have been of the road recently with that stomach bug that is going around.

I spoke with Paddy about your Dad's 18/85 and he agrees post that engine number it is a Mk3 motor albeit the 18/85 is a Mk2 car. Paddy says these pistons and rings are so common he does not stock them. His advice is when the time comes contact the MGB Hive who provide an excellent service and the rings will be with you next day.

The attached photograph is of Paddy's Green Mallard Wolseley 18/85 S at the Paddy Hopkirk Gala at Stormont Castle on 22 February 2014 :lol: :lol: :lol:

Weather permitting I will take some photographs of his Landcrab collection and post them on here next week.

Alan

Attachment:
DSC09557.JPG


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PostPosted: Sun Jan 08, 2017 11:29 am 
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Hi Alan,

Thanks for the information and picture, the Crab looks huge inbetween the Minis.

So Dad's engine would be a 'Mk3' 1800 engine with 4 ring pistons then ?

Looking forward to the pictures of the rest of Paddys collection 8-)


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PostPosted: Sun Jan 08, 2017 12:44 pm 
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Whst would the result be if you ran a five ring piston without the bottom one?


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PostPosted: Sun Jan 08, 2017 1:17 pm 
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Good question Vegard.

Using a 5 ring set on a 4 ring piston would be OK if the upper rings were the same I guess.

Dad has said that years ago when rebuilding freshly bored engines with skirt ring pistons they'd leave the skirt rings off and refit them after the engine had been run in.....or not as the case may be.


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PostPosted: Thu Jan 26, 2017 11:28 pm 
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Vegard wrote:
Whst would the result be if you ran a five ring piston without the bottom one?


Seen it done and it works fine.


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