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803cc piston rings

Posted: Wed Feb 01, 2017 2:18 pm
by 16Cabulrd
my 803cc engine is stamped with a diamond shape containing a figure 3 on each piston and adjacent block. I presume these are standard size as I believe they would be stamped +20, +30 Etc. am I correct? Also I have found it impossible to locate a set of standard rings for the 803, any assistance in obtaining same would be much appreciated.

Re: 803cc piston rings

Posted: Wed Feb 01, 2017 6:13 pm
by A40FARINAGURU
16Cabulrd wrote:my 803cc engine is stamped with a diamond shape containing a figure 3 on each piston and adjacent block. I presume these are standard size as I believe they would be stamped +20, +30 Etc. am I correct? Also I have found it impossible to locate a set of standard rings for the 803, any assistance in obtaining same would be much appreciated.
they are original 'MOWOG' pistons, the number in the diamond denotes the grade which is should also be marked on the top face of the block, basically the factory matched the pistons to the block, there are also grade 2 etc

Re: 803cc piston rings

Posted: Wed Feb 01, 2017 8:47 pm
by Neil Evans
A40FARINAGURU wrote: they are original 'MOWOG' pistons, the number in the diamond denotes the grade which is should also be marked on the top face of the block, basically the factory matched the pistons to the block, there are also grade 2 etc
So they could be oversize if the engine has had a factory 'gold seal' rebuild?

Has the engine still got its engine number tag fitted?

Re: 803cc piston rings

Posted: Wed Feb 01, 2017 8:56 pm
by A40FARINAGURU
Neil Evans wrote:
A40FARINAGURU wrote: they are original 'MOWOG' pistons, the number in the diamond denotes the grade which is should also be marked on the top face of the block, basically the factory matched the pistons to the block, there are also grade 2 etc
So they could be oversize if the engine has had a factory 'gold seal' rebuild?

Has the engine still got its engine number tag fitted?
Gold Seal were marked with the oversize :thumbs:

Re: 803cc piston rings

Posted: Wed Feb 01, 2017 11:02 pm
by gazza82
My A35s 948 is a goldseal and I remember seeing an oversize mark on pistons when we decoked it.

Can't remember if they were plus .010 or .020 though.

Re: 803cc piston rings

Posted: Wed Feb 01, 2017 11:36 pm
by Paulc
The club sells +020/030/040 803cc rings for £12 a set. If you want standard rings ESM sell them for £90.

http://www.morrisminorspares.com/engine ... 40-p830463

Re: 803cc piston rings

Posted: Tue Feb 07, 2017 5:26 pm
by lunnmax
16Cabulrd wrote:my 803cc engine is stamped with a diamond shape containing a figure 3 on each piston and adjacent block. I presume these are standard size as I believe they would be stamped +20, +30 Etc. am I correct? Also I have found it impossible to locate a set of standard rings for the 803, any assistance in obtaining same would be much appreciated.
I will check my stocks.. I have rings , piston sets and bearings.


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Re: 803cc piston rings

Posted: Tue Feb 07, 2017 5:34 pm
by lunnmax
16Cabulrd wrote:my 803cc engine is stamped with a diamond shape containing a figure 3 on each piston and adjacent block. I presume these are standard size as I believe they would be stamped +20, +30 Etc. am I correct? Also I have found it impossible to locate a set of standard rings for the 803, any assistance in obtaining same would be much appreciated.
I have Std rings complete in original box (Hepolite) as well as full piston sets with rings at +20, +30 and +60 let me know what you might need.

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Re: 803cc piston rings

Posted: Wed Feb 15, 2017 9:23 am
by 16Cabulrd
Thanks for reply, sorry for delay in answering, My pistons have 3 rings plus oil control ring. If these are the ones you have please advise cost for the standard., thanks, Terry,