If it's not it either slips and dies, or sticks nicely solidly in. The Type P could handle more torque than the J, the main change being an increase in the M46s output shaft diameter, hence later Type P ODs cannot be retrofitted to the earlier M46s with the Type J OD. The likelihood, the clutch has been made wrong, because the lining has to be within a few minutes of a degree true to the brake ring and annulus. If your overdrive clutch is sticking, the lesson is:. Originally the overdrives had a sort of SAE30 mineral oil that had very low viscosity particularly from cold, where EP oil is very thick indeed, so it is in fact possible to use Dextron.
#Laycock overdrive p type th350 full
Something similar is available from MOTUL - their special full synth oil, and Mobil used to do a special similar SHC.Įngine oil has no such additive, and has other nasties in it. I have ALWAYS USED EP90 in overdrive gearboxes as this contains an additive designed for all hypoid gears (involves intense sliding and sheer action).įor motorsport I got a mil spec oil from Cofran which cost a fortune. I just supplied a TR6 J type box to a guy in Osnabruck, (which apparently nobody else could rebuild properly)**.
#Laycock overdrive p type th350 mod
I have been building boxes for the GT6 for more years than I can remember, and it was me that did the J type conversion/improved mainshaft mod originally. The function of the OD is to change the overall reduction ratio between the engine and rear wheels. I haven't forgotten it, much like the dud E type V12 auto box someone in the UK sold me, which failed after 200 miles (changing that involves removing the engine again!). A Type Overdrive, Part I - Theory Overview: The A type overdrive (OD) unit described here was manufactured by Laycock-de-Normanville and was a factory option on the TR2, TR3, TR4, TR5/250 and TR6 Triumphs through 1972. The whole incident cost me about a grand in time and trouble. The Hardy engineering box is and has always been perfect, no problems in the 15 years that has gone by since on a modified 100/6. everyone in the trade knows Dennis Welch have been selling selectors that jump out of 2nd gear for decades, and his recon laygears are total soft butter.followed by utter bollox as support for their stuff, so as not to have to honour warranties. I got Hardy engineering to rebuild the Healey box, (heard good things about their Healey boxes),Ie. Heard it all before! two returns on warranty later.(FROM FRANCE, and it's not fun to remove a gearbox from a Healey!!!!! TWICE) "the reason why my (WELCH repro) gears failed is because I failed to use engine oil in the gearbox." This, apparently, is ok for the gearbox and works better in the J-type overdrive than the high-pressure stuff.I remember hearing this from that man at Dennis Welch.! I asked the transmission specialists who rebuilt my overdrive last September (before I bought the car) for advice as to overcoming my sticking overdrive (the car has done barely 700 miles since the rebuild, last September).Īmongst other good advice they recommend NOT using EP 80 etc., but a non-synthetic (mineral) 15-30 engine oil.
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