British-Cars.org

Welcome to the DMR Site for British Car Information.

Recommendations

Parts

TR parts and Triumph parts, TR bits, Triumph Car Spares and accessories are available for TR2, TR3, TR3A, TR4, TR4A, TR5, TR6, TR7, TR8, Spitfire and Stag and other TR models are available from British car spares and parts company LBCarCo.

Triumph TR3 - Boring sleeves

Hi Guys:
A friend of mine is trying to rebuild a motor from a 61 TR3.The pistons were siezed and the idiot at the automotive machine shop where he took it beat the pistons with a blunt instrument an succeeded in breaking the pistons and cracking one of the sleeves.I had warned him that "do it yourself" is the only way because most of those shops are populated with the halt,the lame,and the blind.
It is now in another shop and the guy suggests boring the 83mm sleeves to 86mm and replacing the cracked one with a new 86mm.
QUESTION:is it OK to bore 3mm out of an 83 to make it 86?To me that is a lot of material.
Chuck

Chuck-I think the outside dimensions of the sleeves are the same. Perhaps if someone has some 86mm or 87mm liners, they could measure the od.
Berry

When I restored my TR from 1987 to 1990, The bores and pistons were worn and there were ridges at the top. I decided I'd go with all new pistons/rings/sleeve liners as a set. They came all together. I don't know but I assume they were a matched set. My neighbour did the assembly and he got all the pistons to the same weight and all the con rods to the same weight, by removing metal where it was available.

Since 1990, I've driven over 70,000 miles on all this and it still runs great. It runs so smooth - also at idle of 300 rpm, it just keeps ticking over but it won't stall.

Compare the cost of re-bore + 4 new pistons + 1 new liner + a set of new rings. It might be cheaper to buy all new.

Don Elliott, 1958 TR3A
Don Elliott

Yes, I would agree with Don. Just buy a whole new set. That way they are more likely to be matched. Also follow Don's advice and get everything balanced. I didn't and the engine feels a bit rough to me, but it still goes like a train.
Nick
n morgan

This thread was discussed on 16/11/2002

Triumph TR3 index

This thread is from the archives. Join this live forum now