Tri­umph TR6

TR6’S ooz­ing gear­box and clonky ex­haust made to be­have

Practical Classics (UK) - - CONTENTS -

In my pre­vi­ous Staff Car Saga, I de­scribed how the TR6 was suf­fer­ing from a flick­er­ing speedo nee­dle and a rat­tling ex­haust sys­tem. The di­ag­no­sis was a sticky speedo ca­ble and a bro­ken ex­haust bracket that mounts from the back of the over­drive/gear­box. While I had the gear­box tun­nel cover out, I also de­cided to try and stem the mul­ti­ple oil leaks from the gear­box and over­drive that have plagued the TR ever since I bought it around 12 years ago. It was ob­vi­ous EP90 was ooz­ing from pretty much every place it could on the gear­box and over­drive. Rea­son­ing that it’s un­likely every gas­ket and oil seal would fail si­mul­ta­ne­ously, I started won­der­ing if the breather was blocked. Re­mov­ing the filler plug re­sulted in a gen­tle whoosh of es­cap­ing air, again sug­gest­ing a breath­ing prob­lem.

I looked for a breather to un­block, but found noth­ing. The ever-help­ful chaps on the TR Reg­is­ter fo­rum ex­plained that TR gear­boxes have two pos­si­ble breather lo­ca­tions, ei­ther a tiny hole on top of the gear­box cover, or a cylin­dri­cal breather on the over­drive. My TR had no breather hole on the top cover and a blank­ing plug screwed into the over­drive cas­ing where the breather should fit. With no breather at all, it was lit­tle won­der the gear­box was pres­surised and leak­ing.

Feel­ing op­ti­mistic that I might have found the cause of the long-term leak­age, I pur­chased a breather and fit­ted it to the over­drive in place of the blank­ing plug, then topped with fresh EP90. Since then, the gear­box has barely lost a drop of oil and the drip tray on the garage floor is now re­dun­dant. A small victory per­haps, but after so long it felt good to fi­nally nail this prob­lem – and not a sin­gle gas­ket or oil seal needed re­plac­ing!

Up the bracket

My next port of call was the ex­haust, which had been rat­tling at tick­over due to a bro­ken bracket that con­nects it to the over­drive mount­ing and cross­mem­ber. I ex­pected I’d have to weld up the old bracket, but found that Rim­mer Brothers had new ones on the shelf at a rea­son­able price. The bracket was or­dered and bolted in, then I re­placed the ex­haust, hang­ing it care­fully to avoid pipes knock­ing on the chas­sis rails.

Time to move on to the speedo ca­ble. Speedy Ca­bles lived up to their name and quickly supplied

Oil well

New breather means EP90 stays in the gear­box rather than on the floor. Also in Nigel’s garage 1977 RE­LIANT SCIM­I­TAR GTE The Scim­i­tar is my daily driver at the mo­ment. It’s smooth, com­fort­able and eats the miles eas­ily.

Work done Fin­ish­ing off jobs around the TR6 gear­box; they turned out to be big­ger than ex­pected. GT6 body re­pairs com­pleted – it’s now ready for paint.

Nigel Clark

CON­TRIB­U­TOR 1970 Tri­umph TR6 En­gine 2498cc/in­line 6/OHV Power 150bhp@5500rpm Torque 164lb ft@3500rpm Gear­box 4-speed man + o/d 0-60mph 8.2sec Top speed 119mph Fuel econ­omy 28mpg

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