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5th oil ring holding block needs to go

Posted by gurunutkins

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5th oil ring holding block needs to go #1
gurunutkins Barri Herman Issaquah, WA, USA 1965 MG 1100 1968 Austin 1300 1969 Lotus Super Seven 1971 MG MGB 1973 Mercedes-Benz R107 → more	Posted: March 10, 2011 04:19PM Registered: 2 years ago Posts: 358

I put this on the midget forum too any advice would be great _ I will post to mm as well

Hi folks
looking for some expertise from this forum as the 1100 / 1300 forum doesn't get too much traffic yet

I am rebuilding my 1098 ADO 16 engine - its basically the same as the midget / sprite 1098 engine. I am about to install a set of 5 ring 40 thou over pistons. I have put on the new rings but cannot get the 5th oil ring to compress enough. I assumed that the 5th oil ring would account for the small block in the groove meant to position it but that is not the case. The ring fits into the bore with the same end gap as the top ring as you can see from the 2 pictures but the small block in the groove is keeping the ring from compressing. The obvious solution is to remove the block! its just got a small mushroom head on the inside skirt of the piston - easy to tap out and everything will fit. BUT . . . . can I do that? Is the block critical for some function or is it just a nice though?
any help appreciated
cheers
Barri

in the MGB forum its a 1971 MGB - pretty standard unless the PO screwed it up. if I'm posting in the 1100 & 1300 forum its a 1965 MG 1100

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Re: 5th oil ring holding block needs to go #2
gurunutkins Barri Herman Issaquah, WA, USA 1965 MG 1100 1968 Austin 1300 1969 Lotus Super Seven 1971 MG MGB 1973 Mercedes-Benz R107 → more	Posted: March 10, 2011 04:20PM Registered: 2 years ago Posts: 358

and the back of the pin holding in that spacer block

in the MGB forum its a 1971 MGB - pretty standard unless the PO screwed it up. if I'm posting in the 1100 & 1300 forum its a 1965 MG 1100

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Re: 5th oil ring holding block needs to go #3
gurunutkins Barri Herman Issaquah, WA, USA 1965 MG 1100 1968 Austin 1300 1969 Lotus Super Seven 1971 MG MGB 1973 Mercedes-Benz R107 → more	Posted: March 11, 2011 01:47PM Registered: 2 years ago Posts: 358

got my answer on the midget forum. the block stays - file down the bottom oil ring!

in the MGB forum its a 1971 MGB - pretty standard unless the PO screwed it up. if I'm posting in the 1100 & 1300 forum its a 1965 MG 1100

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Re: 5th oil ring holding block needs to go #4
LittleBritishCar Rick Anderson Napa, California, USA 1966 MG 1100 "Julia" 1975 MG MGB "Chiquita"	Posted: March 11, 2011 10:09PM Registered: 2 years ago Posts: 853

Glad you figured it out - I was just going to post. Where did you get the pistons? I am going to do a build soon.

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Re: 5th oil ring holding block needs to go #5
gurunutkins Barri Herman Issaquah, WA, USA 1965 MG 1100 1968 Austin 1300 1969 Lotus Super Seven 1971 MG MGB 1973 Mercedes-Benz R107 → more	Posted: March 11, 2011 10:40PM Registered: 2 years ago Posts: 358

Hi Rick
the pistons and rings came with the car. The rings are grant, from CA I believe, here is a link to their catalog - the MG 1100 are the second line down and the overbore is listed as .010 for 10 thou up to .060 for 60 thou over.
http://www.grantpistonrings.com/_Catalog_PDFs/BLMC%20-%20MG.pdf
I also have a full set of bearings as I had standard sizes but had to get the crank reground 10/10 so I will post the standard bearings on ebay.
I'm just going to update my rebuild thread with a few pictures.
cheers
Barri

in the MGB forum its a 1971 MGB - pretty standard unless the PO screwed it up. if I'm posting in the 1100 & 1300 forum its a 1965 MG 1100

Sponsored Links. You can hide this ad & support this site by upgrading to a Gold Membership ~ click here for more info.

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Re: 5th oil ring holding block needs to go #6
LittleBritishCar Rick Anderson Napa, California, USA 1966 MG 1100 "Julia" 1975 MG MGB "Chiquita"	Posted: June 10, 2011 06:17PM Registered: 2 years ago Posts: 853

I scored a set of similar 40 over NOS pistons for $100. A few people have advised me to leave the 5th ring off altogether but I wouldn't feel comfortable doing that.

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Re: 5th oil ring holding block needs to go #7
gurunutkins Barri Herman Issaquah, WA, USA 1965 MG 1100 1968 Austin 1300 1969 Lotus Super Seven 1971 MG MGB 1973 Mercedes-Benz R107 → more	Posted: June 17, 2011 12:16AM Registered: 2 years ago Posts: 358

I was told the same thing but didnt want to risk it either. getting close to finishing it now but my new job is sucking up all of my spare time! need the job to buy the parts but then dont have the time confused smiley

in the MGB forum its a 1971 MGB - pretty standard unless the PO screwed it up. if I'm posting in the 1100 & 1300 forum its a 1965 MG 1100

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Re: 5th oil ring holding block needs to go #8
lbcnut James Woolf NC, USA 1964 MG MGB	Posted: October 04, 2011 06:47PM Registered: 8 years ago Posts: 5,765

This is NOT James(ibcnut) .but tim trevithick ( forgot my ID details) ;- As long as you have a segmented (3 or more pieces) oil control ring (above the pin) you can leave off the skirt ring :- history of the '5th' ring ..in Uk where this style of piston was initially produced by 'Hepolite'..(aftermarket replacemnts..which were adopted as a BMC supplier in late 70's ..sometimes offered in Gen 'BMC' packaging) because most english machine shops from 1950's through early 1980's did NOT use finishing hones..and bored to piston size...leaving a rough finish..which lead to excessive oil consumption on the original 4 ring pistons .. to counter this problem hepolite produced a 5 ring piston.. with 2 oil control rings.. again.. its NOT a neccessity in a properly finished bore ..the origianl style iron one piece oil ring is not very efficient ..if by chance you fit a segmented oil ring and an iron one below skirt..it will lead to premature bore wear ..due to not enough oil getting to upper part of bore ..with 2 iron oil rings the issue is not severe..but you have extra friction..from one uneccessary ring ..another note on 'hepolite' parts.:-the 'apex'ring sets have a stepped top ring..to miss the ridge at top of cylinder.. so one does NOT have to remove the ridge ..a light honing will suffice.. plenty still avail via internet..if you take time to search. another note on 5 ring pistons.. 'hepolite' like all buisness's taken over by corporate shenanigans that signified the growth of the 'financial services sector' came under the marketing banner of 'county' ..they continue the same pattern of 5 ring piston to this day .. produced wherever they can make the most profit ..hence some batches are somewhat shoddy.. different sizes and different wieghts in same package..caveat emptor. check wieghs and dimensions carefully .. or buy old stock or OEM when poss..

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