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Improving camshaft lubrication.

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Mikelead Mike Leadbeater
York, Yorks, UK   GBR
1953 MG TD
XPAG camshafts seem prone to wear, and there are reports of inadequate lubrication of the lobes and follower faces.

I was discussing this with a fellow enthusiast, who suggested grooving the cam followers from the lower cross-hole down to the lower end, to allow oil to run down the follower side onto the cam.

This set me thinking, have others done this ? or some other mod to improve cam lobe lubrication?

Cheers

Mike

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Buckdendave David Hill
St Neots, Cambridgeshire, UK   GBR
1954 MG TF
I've done it - very easy with an angle grinder. Don't know if its made any difference though. (I agonised over whether to do it or not, fearing some kind of catastrophic failure, but logically couldn't think of any negative reasons, so went ahead, and so far so good.)
Dave H

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crankjournal Avatar
crankjournal Len Fanelli
Yonkers, NY, USA   USA
Roller camshafts simply do not wear out.
"A roller cam will always outperform a flat lifter cam of the same duration"!
Len Fanelli
Abingdon Performance Ltd.
MG T type Flat lifter and roller lifter cam kits.

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Richs TD Farm Richard Cameron
Columbia, KY, USA   USA
Peter Edney shows some modified lifter he sell in England https://mg-parts.co.uk/index.php?route=product/category&path=3_279_281

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EXLU3453 Avatar
EXLU3453 Colin T
Brantford, ON, Canada   CAN
Make sure any restriction is removed in the Cylinder head banjo bolt. Flow as much oil as you can.
... CR

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jacmimi jack sohet
tinlot, liege, Belgium   BEL
1951 MG TD
here is an article that explains a simple transformation (that I made) and effective

http://ttypes.org/ttt2/mods-and-rockers

Jac

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Buckdendave David Hill
St Neots, Cambridgeshire, UK   GBR
1954 MG TF
Forgetting to seal off those holes seems far fetched, especially as they left them unaltered for years. Can see pros and cons for that modification. Several breakages of the rocker shaft have been mentioned on the other forum - usually associated with recent replacements, though stronger springs may have been detrimental to some. They always go at that drilled hole (stress point).
Dave H

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plus4moggie Tom Lange
Bar Harbor, ME, USA   USA
It seems totally unlikely that MG would acknowledge a problem in 1938, and then proceed to do NOTHING about it through the TB, TC, TD and TF runs, until 1955... Perhaps it was something unique to the TA engine?

Tom Lange
MGT Repair

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Steve S Avatar
Abingdon West, Southern California, USA   USA
I agree, and will add that I've never noticed unusual wear due to a lack of lubrication on my rocker shafts. Every machinist I've spoken to who knows these engines (including rocker arm specialists) notes that the quality of the original XPAG rocker shafts is very high, so perhaps there is a quality issue with some aftermarket shafts. It also seems to me that by placing the oil feed opposite the top hole, you would not negatively affect anything by letting some oil out the top where the load is the least. And putting extra oil on the rocker tips can only be a good thing.

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jacmimi jack sohet
tinlot, liege, Belgium   BEL
1951 MG TD
I realized the transformation.
the drilling diameter is 2.5 mm which corresponds to the drilling for the M3 thread tapping.
so I placed M3 screws
After 1000 km of driving, here are my findings:
- Less valve noise when rolling,
- Oil deposit on the cylinder head (rocker cover removed) identical.
- slight increase in oil pressure

this transformation seems to me mechanically interesting because it promotes a more adequate distribution of oil to the contact surfaces: axes, pushers and valve heads


we also talk about it on this site : http://www.mg-cars.info/mgtd-mgtf1500-bbs/rocker-holesoil-pressure-2014121822245818782.htm

Horst schach also talks about it in his book "restoration manual" on page 73

Jac



Edited 1 time(s). Last edit at 2019-03-20 01:04 PM by jacmimi.

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