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Technical Conrod Bearings

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Technical Conrod Bearings

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alfavirusnz

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What are people using instead of the single hole bearing shells? The F engine I am overhauling has the original single hole shells which coincide with the rod oil feed/squirter that sqirts oil to the gudgeon pin and underneath of the piston crown. The 2 hole items I have just taken delivery of I am reluctant to install as there seems a possibility of no , or insufficient lubrication to the gudgeons. The original style bearing shells seem after a thorough search to be now unobtainable however in the Haynes manual and in the parts suppliers listings there is no mention of any production modification nor the need to change conrods to a later modified type.
 
I fitted a pair of 126 rods to get over the problem as this seemed a better option than drilling an extra hole in the shells.
 
Thanks for the reply but ideally I am trying to use the original rods if possible. I have two engines to rebuild as restoring two cars.
At this stage it looks like I will have to drill a hole in the shell to coincide with the squirter hole in the rod.
 
alfavirusnz said:
Thanks for the reply but ideally I am trying to use the original rods if possible. I have two engines to rebuild as restoring two cars.
At this stage it looks like I will have to drill a hole in the shell to coincide with the squirter hole in the rod.
Click to expand...
Hi....a few years later....seem to have same issue as you did. What did you do in the end ? Drilled a bigger hole in the bearing ?
 
afdeidda said:
Hi....a few years later....seem to have same issue as you did. What did you do in the end ? Drilled a bigger hole in the bearing ?
Click to expand...
GLYCO bearings are "3-hole" shells---available from Mark at "Motobambino" if you are in the UK, or "Autodoc" (who are in Germany)
 
i rebuilt an engine that had seized because the wrong big end shells had been fitted thus stopping any piston lubrication So definitely one to look out for. All 499cc engine con rods have the single squirt hole which carried on to the early 594cc engines in the 500R and first series 126 models. If you already have the single hole shells that do not quite line up the holes rather than drill the hole larger I would take a small round file and ease a channel across on the back of the shell to leave the bearing surface untouched. As the Hobbler says the shells available now are universal with 3 holes and the packs are marked as suitable for cars 1957 to 1996. 917E7EFC-4CA0-41E2-8227-4DE01AE12832.jpeg
 
the hobbler said:
GLYCO bearings are "3-hole" shells---available from Mark at "Motobambino" if you are in the UK, or "Autodoc" (who are in Germany)
Click to expand...
Hi thanks, I do have the 3 hole bearings but the single hole on the rod is offset towards the outside with respect to the diameter.
thumbnail_20220107_163434.jpg
thumbnail_20220107_163452.jpg
 
Toshi 975 said:
i rebuilt an engine that had seized because the wrong big end shells had been fitted thus stopping any piston lubrication So definitely one to look out for. All 499cc engine con rods have the single squirt hole which carried on to the early 594cc engines in the 500R and first series 126 models. If you already have the single hole shells that do not quite line up the holes rather than drill the hole larger I would take a small round file and ease a channel across on the back of the shell to leave the bearing surface untouched. As the Hobbler says the shells available now are universal with 3 holes and the packs are marked as suitable for cars 1957 to 1996.View attachment 400359
Click to expand...
Thanks, I replied to hobbler adding some pics. I think I was not clear about the offset of the hole in the rod..it's not along the diameter but towards the side of it. I attached some pics.
 
Yes I saw that in your earlier picture. Seems to me the conrod is at fault And the hole has to match up with the Crankshaft which is why I suggested creating the channel.
 
Just going through some spares this morning and found 500 & 126 con rods. The oil hole offset on the 500 is quite plain to see. The two holes on the 126 one are central.
6758B099-15B3-40C3-BD51-8FBD115A788C.jpeg
5123625E-E1D8-4379-BFAC-7E07B0A337FC.jpeg
 
Toshi 975 said:
Just going through some spares this morning and found 500 & 126 con rods. The oil hole offset on the 500 is quite plain to see. The two holes on the 126 one are central.View attachment 400654View attachment 400655
Click to expand...
yes....just like mine. So why are the bearing holes not aligned with the one of the rod ? Is there a reason ? Are there bearings ... or were there bearings with offset holes ? Could it be to try and get oil between rod and bearing ? Who knows ???!?!?!?!
 
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