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MG TD TF 1500 - conrod oil squirt hole

Not sure if this has been mentioned or discussed before a I am a new member my apologies if I'm rehashing an old subject.

My father and I are rebuilding a 1950 mg td and are busy working on the engine at the moment. We were in the process of reassembling the engine when he noticed the conrod oil squirt holes have actually been welded up (sealed) for some reason. Has anyone else heard of this before?

We have a spare engine which we have stripped for various miscellaneous parts and we noticed the oil squirt holes on those conrods are open as would be expected.

Do we leave it like this or should we open the squirt holes out?

Any feedback on this would be greatly appreciated. Thanks all.



A Johnson

Although they are close to the low end centerline(?), that can't help balance much can it?
gblawson(gordon)

The internal oil lubricating system allows pressurized oil to flow to the various bearing surfaces.
Flowing out the drilled hole of the crankshaft and into the connecting rod bearing which has the channel cut into it. This allows the crankshaft to be lubed, the oil now travels through the hole in the connecting rod bearing through a drilled hole in the connecting rod itself, this is what I think you to say is "welded" shut. The oil now flows through the connecting rod to lube the wrist pin. The wrist pin connects the piston to the connecting rod, the little end. The oil then drips back into the oil pan and continues yet another cycle.

Not trying to be smart here, but don't assemble it with those holes welded shut or you'll be doing this all over again real soon.
L. B. Tyson

I would be curious to know why someone would weld those holes up? The rods must definitely be out of balance with that gob of weld on them. Hard to believe they didn't even try to grind the gobs off to conform to the shape of the rod. I wonder how long this engine ran in that condition? It has always amazed me how the manufacture of a product spends tons of money developing and proving their product and a hammer and chisel man comes along and thinks his idea is better. It takes all kinds I guess. PJ
Paul Jennings

I'm wracking my brains trying to remember what engine I encountered where the shop manual instructed owners to weld up those oil holes after a few thousand miles, to prevent over-oiling. Anglia 100e?

Tom
t lange

"The oil now flows through the connecting rod to lube the wrist pin."

Through??? I never thought the connecting rod was hollow. I always thought the gudgeon pin was lubricated by splash.
Geoff Love

I have never seen a hole up through the center of an XPAG/EG or other MG connecting rod in the past 30 years of rebuilding English cars.
Sandy
SANDY SANDERS

My new rods from Crower did not come with the hole in them and I asked both Crower and my engine builder what the deal was and they both replied that the hole was 1930 technology and was not used these days. I should say that I also have a new billeted crank and pistons that are considerably shorter than normal in my car adn I have had no trouble with no holes in the rods.I was told that shorter pistons skirts of today no holes are needed. My 2 cents worth.
Tom Maine


I believe the hole is there to spray oil on to the thrust face of the bore.As there is so much oil being thrown all around the internals,I dont think it makes any difference if they are welded up.
Ray
TF 2884
Ray Lee

Hi All,

I think that the idea of the hole is for a squirt of oil to be flung onto the thrust side of the bore whilst the engine is working.

I wonder if some "bright spark" thought that by welding up the hole he could improve oil pressure.

Russ
TD,PB

R Dade

This thread was discussed between 16/05/2010 and 17/05/2010

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