Bmc liner 3.8. 8.9 mm flange depth about 17 mm width

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Lord adam
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Joined: Sat May 18, 2019 6:54 am
Great Britain

Bmc liner 3.8. 8.9 mm flange depth about 17 mm width

Post by Lord adam » Mon May 20, 2019 9:50 pm

Can’t find the right liner think it may be a comershal engine fitted in a a universal.



ploughman
Posts: 101
Joined: Sun Apr 01, 2018 6:21 pm

Re: Bmc liner 3.8. 8.9 mm flange depth about 17 mm width

Post by ploughman » Mon May 20, 2019 11:18 pm

Evening,
I believe that a universal should have a 3.4 engine, have you checked the engine number?
Regards,
Harry

Lord adam
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Joined: Sat May 18, 2019 6:54 am
Great Britain

Re: Bmc liner 3.8. 8.9 mm flange depth about 17 mm width

Post by Lord adam » Tue May 21, 2019 7:17 pm

No it’s a 3.8 100 mm bore

ploughman
Posts: 101
Joined: Sun Apr 01, 2018 6:21 pm

Re: Bmc liner 3.8. 8.9 mm flange depth about 17 mm width

Post by ploughman » Wed May 22, 2019 12:05 am

Hi,
probably a replacement unit as you suspect though I am not sure as to the change. In any case liners are freely available, but there two types that I know of, one with a flat top flange, and the other with a "fire ring" they are interchangeable in sets and protrusion is measured from the flat area of the flange, beside the fire ring.
Regards,
Harry

Lord adam
Posts: 4
Joined: Sat May 18, 2019 6:54 am
Great Britain

Re: Bmc liner 3.8. 8.9 mm flange depth about 17 mm width

Post by Lord adam » Wed May 22, 2019 7:52 pm

Ok doint think you are getting it there are liners out there for bmc 3.8 but I can not find the one I need it’s got a fire ring the depth of the flange is 8.9 mm not measuring the fire ring no shims fitted. Iv found one with a 10 mm flange I’m thinking il need to machine it down but I’d rather have the proper one

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JohnP
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Great Britain

Re: Bmc liner 3.8. 8.9 mm flange depth about 17 mm width

Post by JohnP » Thu May 23, 2019 3:46 pm

I found the following information, I don't know if it helps.

"In September 1972 an Information Bulletin was issued regarding the fitment of 100mm bore 86K 1190 'Service' liners to existing 28TD & 38TD cylinder blocks.

This necessitated the liner counter bore to be re-machined to a depth of 11.049mm to 11.100mm. Since the liner 86K 1190 had no undercut below the flange the counter bore radius had to be machined to a maximum of 0.254mm to prevent a foul condition.

The diameter of the counter bore was machined to 117.424mm to 117.450mm. This was to ensure a minimum liner to counter bore clearance of 0.127mm.

The liner must sit square on the bottom face of the counter bore after machining and the liner stand proud must be checked."
JVP

If it ain't bust don't fix it!

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