01-28-25 - Day 02 - 67 TR6 Bad News

Miscellaneous repair efforts on vintage British Motorcycles.

[@russturner1570]

A few observations.........Not a good idea to purchase valve guides until you determine whether or not they are std or oversize. Triumph did not fit valve stem seals until circa 1981(.OK to use on early models but fit on the inlets only). Get your machinist to slightly countersink the pushrod tube holes as an aid to avoid damage when fitting seals ( use rubber grease when fitting ). Head gasket is very wet so I would be pulling the barrels off to investigate!.Your call ,Cheers, Russ.

[@fjdelmonte]

I agree with you on all points. Thanks! Ride Safe!

[@Revilo1958]

From what I can see looks like the little ends have got very hot too might be best to replace them and you need to find out why it had what looks like a partial seizure. great videos love watching them

[@fjdelmonte]

Hot, yes. Bad enough to split the engine? Not sure. Cause? Probably running low oil at high speeds. Tank had very little oil in it. Rods are tight at both top and bottom. No vertical slop. Splitting costs about $1500 - $2000 in parts and labor. Decided not to split the engine. Good or bad decision? Not sure. Time will tell. Possibly catastrophically. Possibly not. Pray for not. All of the above is simply my opinion. I could be wrong. Thanks for writing. Ride Safe. Frank

[@Revilo1958]

@@fjdelmonte I was talking about the little ends (the little bush on top of the con rod what the gudgon pin (wrist pin) locates in) I dont know what you call them over there you dont need to split the cases to replace them

[@fjdelmonte]

Oh, I just think of them as wristpin bushings. They seem ok but I will double-check to make sure there is no deformity or wear. Thanks!

[@dogpaw775]

i use an old plug welded to a bit of hex stock, makes the head easily orientated in the vice and keeps the gasket surface out of harms way. Never heard of guides being sleeved, why go to all that trouble when guides are available ?. run on no oil or low oil?. i'd check the return flow and pump of not done already.

[@fjdelmonte]

Oh, I see. With the welded plug tool you can support the head and then put the spring compressor on the head easier. Interesting! Re: Guides. Sleeving the guides is easier and faster and less traumatic to the head casting. I had one machinist who swore by them and one who swore at them. I've done a lot of bikes both ways. Sleeving means you don't have to wait until the old guides are out before buying the new, possibly oversize guides and sleeving uses the existing "geometry" of the old guides so the angle of the dangle of the valves to seats "should be" unchanged. On the other hand, depending on the machinist's preference, I just go ahead and buy .005 oversize guides and assume the holes need cleaning up anyway. Thanks for writing. Ride On!

[@Sol-k8v]

I would want to be certain about the cause of the damage, appears to be lack of oil, maybe a full strip required?

[@adammedyna2365]

It would be beneficial for the engine to use better quality rocker box gaskets, like John Healy's cov seal ones.

[@sussaxonsarthois6815]

I agree that the gasket looked very wet and I've not noticed that burnt stain on the (few) heads I've removed, yet that wasn't the source of any leak?

[@fjdelmonte]

I actually did not see any oil leaking in the short time I ran the engine. The right side compression (90 lbs) was 30 lbs less than the left side (120 lbs) and the right side was blowing so much smoke I decided it could be harmful to run the engine anymore and to simply start disassembling it. It was a good decision as shown by the stuck rings and scored pistons. Also, the top oil seal in one of the push rod tubes was split, so it is/was most likely the source of the/any oil leak. So the head had to come off anyway. The head will be planed flat, the cylinders bored, and all new pistons, rings, valves, and guides, gaskets and seals will be installed.

[@GrahamRozee]

The G in gnarled is silent

[@fjdelmonte]

As is the P in Ptomaine, the K in knife, and the G in gnome. But it's fun to have fun with them. Just my sense of humor. Ride On! Ride Safe! F.

[@p--n]

How do the big and little ends feel?

[@fjdelmonte]

Actually the con rods upper and below seem just fine. No vertical slop at all. I am constantly impressed with how strong the bottom ends of these old engines are.

[@daveco1270]

Very educational video. I'm dealing with a smokey right side cylinder on a T140. Haven't taken it apart yet. What size was that stud remover socket you used to take the rockerbox and base studs out? Or was that too different sockets? (I need to buy some stud removers, but I'm not sure which ones I'll need for my Triumphs.)

[@fjdelmonte]

I bought a set of 8 stud removers. So I just use whichever fits the best. Here's a link kzbin.info?event=comments&redir_token=QUFFLUhqa25YVFotMnhzREg3NUNhUHNQakxKeWRBTHNkZ3xBQ3Jtc0tsRU9nSU9qdDRwdEs1TWhSYXFuV3lwTkluRFRIVVM0SldMUnlDLXdmcHhrZGxRNllJVUJnUm81bDJ1RmEwZG9uZFJ5eEZlU29ZOTZJbGxNMlBBWVhUc2QtT2lCeHVWSHd2dHM4NDVSLVBJTVFCVHRpRQ&q=https%3A%2F%2Fwww.grainger.com%2Fproduct%2F45FF47%3Fgucid%3DN%3AN%3APS%3APaid%3AMS%3ACSM-2295%3A869L1S%3A20501201%3AAPZ_1%26msclkid%3Dca75361e62be10276349518fe4c96112%26gclid%3Dca75361e62be10276349518fe4c96112%26gclsrc%3D3p.ds&stzid=UgzqyeO8C1niLqas9Ql4AaABAg.ADbpbPIU-yEADbwb8LJEze .

[@daveco1270]

@@fjdelmonte thanks. I'm grab one of those sets for my garage.