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Laycock overdrive j type
Laycock overdrive j type







Simply add shims to up the pressure or remove them to decrease pressure if you go to far. The little washers in the middle are in fact the adjusting shims to increase the pressure. I have tried to show the relief valve parts laid out in sequence. Primary filter removed showing access to, Top main filter, middle is the pump/piston assy and removing the bottom plug reveals the relief valve. Here are some pics of how you get to the relief valve and what it looks like. I believe the Stag J/Type runs at around 550 psi and will set it to that eventually if that is correct. Result of the pressure test was that it was running at 380 psi, I then shimmed the relief valve and it upped it to 490 psi. I used ATF to run the pressure test thinking that it is relatively thin when cold and would simulate gear oil when warm (and clean out my gearbox too). Next I ran it up on my test rig to see if it was working.ĝon't Laugh too hard it works :P Here are some pics of it all swapped over, Then it was just a case of fitting the old rear cover and associated speedo bits to the back of the new unit and fitting it back to my gearbox.Įerrrrrrrrrr not quite but only a small problem of the studs in the volvo nit being to long to be able to get everything bolted up.Ī quick swap over of the studs and all was well, even the rear propshaft output flange is a perfect fit D D D Then removed the old unit from my gearbox and removed the propshaft output flange, speedo worm drive and speedo drive spigot. Thankfully the swap over was just as straight forward as I had hoped, I took off the rear housing and propshaft flange from the new P/J Type overdrive. Here are a few pics of the gearbox and the new overdrive side by side for comparison. Once the overdrive arrived I took off the rear housing and had a look to see if there was a speedo worm drive under the spot where the casing was not machined for the speedo drive spigot, no such luck only a spacer between the bearings, however on the bright side of things the inside of the unit looked brand new and still had traces of some sort of red test fluid (possibly ATF).Īll I had to do now was take out the GT6 gearbox and get cracking.įinally took the gearbox out last weekend :B :B :B I hoped that it would all just bolt onto my existing GT6 gearbox and with a change over of the rear propshaft flange be a straight forward fit. OK as you can see there is no provision for a speedo drive output, (the volvo speedo is driven via a propshaft sensor) I would cross that one when I had too. It was described as a new old stock unit that had been in storage for some time and possibly kicked around the garage floor a bit too!!! Looking through ebay I spotted this unit and thought it looked very similar to the J/Type fitted to my GT6. Suggesting that the last and possibly the best unit made was a P/Type overdrive for the Volvo fitted to the 740 turbo of around 160bhp and 175 ft/lb torque. version uses a larger 1.375 outer diameter output shaft for higher capacity and a longer rear case." The Volvo version kept the same package size as the J-type but with the updated 18 element freewheel and stronger splines through the planet carrier. The P-type overdrive marked the last updates and included both a Gear Vendors U.S.

laycock overdrive j type

The J-type overdrive was introduced in the early 1970s, and was adapted to fit Volvo, Triumph, Vauxhall/Opel, American Motors and Chrysler motorcars, and Ford Transit vans.

laycock overdrive j type

In 1959, the Laycock Engineering Company introduced the D-type overdrive, which was fitted to a variety of motor cars including Volvo 1s, Sunbeam Alpines and Rapiers, Triumph Spitfires, and also 1962-1967 MGBs (those with 3-synchro transmissions).įrom 1967 the LH-type overdrive was introduced, and this featured in a variety of models, including 1968-1980 MGBs, the MGC, the Ford Zephyr, early Reliant Scimitars, TVRs, and Gilberns. Later the A-type overdrive was to be fitted to the entire range of TR cars. Several famous marques used A-type overdrives, including Jaguar, Aston Martin, Ferrari, Austin-Healey, Jensen, Bristol, AC and Armstrong Siddeley. The first unit to be created was the A-type overdrive, this was fitted to many sports cars during the 1950s. "The first production vehicle to feature the Laycock system was the 1948 Standard Vanguard Saloon. Been a long time since I have posted (but reading a lot) on here as I have been driving the car not tinkering with it too much.Īnyway I have been fiddling and I hope this may help someone outĪs one or two of you may know I was having overdrive problems just before the last 10CR and tried (unsuccessfully) to fix it at the time.Īfter the run when it gave up completely I started to look around for a replacement unit and found this info on wikipedia,









Laycock overdrive j type