Jump to content

300tdi, r380 on LT77 mounts

ren ching

Recommended Posts

Hello All

I'm Dave and I'm in the USA with a 1984 LR 90 RHD. It started out with a 2.25 petrol and lt77 5 speed. I am putting in a Disco 300tdi with the proper defender r380 5 speed. I am using the old lt77 mountings rather than the 300 tdi crossmember so as to be able to keep my original floors and tunnel, propshafts, interior bits, etc. This will also create 2 inches of additional room in front of the engine that can be used later for air-con or a full width intercooler. I have moved the pins on the radiator/IC frame forward by 1" to bring that assembly back closer to the engine, and thus allow a better fit of the hoses and pipework and also putting the engine fan back within the shroud.

I have seen a few such installations in trucks that have come over from the UK but I have found a relative dearth of online information on the subject of this conversion. There is some mention of it on this forum but fairly well buried. I have found one or two individuals in the US that have done it with LHD drive trucks, but no one here in the states has done a RHD that I have heard of so far. So on that note, I would like to share some of the problems and issues I have run into, and hopefully hear back with some experiences from owners in other parts of the world where this may be more common.

First of all I have had a very difficult time locating the engine properly using the factory style tdi engine mounts that get welded to the frame. I have not been able to get the engine and gearbox combination to sti straight in the frame, in other words, they are not parallel to the frame rails. The front of the engine was too far to the right and the rear of the gearbox was too far to the left. Through careful measuring of the tdi gearbox mounts I have determined that the gearbox on the tdi is actually mounted 1 inch further to the right than the older lt77 setup. Since there is no side-to-side adjustment in the 300tdi engine mountings this is forcing the drivetrain to sit crooked.

Removal of the gearbox mountings allowed the engine mounting rubbers to relax and sit properly, but now the gearbox mounts no longer fit. I phoned up a friend in New York that has a 1983 110 with the same conversion and asked him to have a look at his, and sure enough his engine is crooked too! I have some ideas about how to fix this <welder> but I would like to know if anyone else has seen this crop up. if anyone has access to a factory 300tdi and a factory lt77 truck and can measure from the handbrake drum to the RH frame rail, that would answer the question pretty quickly.

Additionally, there is an issue with the engine fan hitting the steering box on a RHD vehicle, and if the height is correct to center the fan in the fan shroud, then the diff-lock linkage starts to get very close to the gearbox tunnel.

Last but not least I have found the 300tdi radiator assembly is 1/2" taller than the old 2.25 unit, necessitating some modification of the frame towers under the rad or the upper support brackets. I am planning to use the proper 300tdi upper brackets but even they fit a bit differently on my old 90 and they also get in the way of the outer two bumpers on the underside of the bonnet.

I'll have to work on some photos, I'll try later this evening, which will be more like morning for the GMT folks.

Thanks for looking,

Dave in DC

Link to post
Share on other sites

wow, that looks pretty close. I modified the RH frame bracket last night, came out pretty good. Now I need to redo the LH one and hopefully

all will fall into place.



I have a TDI with R380 on V8 mounts that sounds to be mounted simmilar to yours, from outer edge of handbrake drum to RH chassis is about 27mm.post-3233-12532280323_thumb.jpgpost-3233-125322806437_thumb.jpg

Link to post
Share on other sites

motor and trans are now sitting in their final position. I elongated the engine mounts holes on the chassis to allow those mounts to "relax" if there is any misalignment. I shortened the RH frame bracket for the gearbox by 3/4" and added the same to the LH mount. If you sight down between the fan clutch hub and the front crossmember you can see whether the engine is sitting straight. FInally, mine is! :)

Now to get on to making the thing actually run...

Link to post
Share on other sites

Photos are up. Sorry I'm slow to put up photos. I'm happy now with the final location and am sourcing some small items to get it all hooked up. I will need to make a custom exhaust too. Thrilling I know :)


Glad you got her lined up Dave. Looking forward to seeing that 3 hundy throw mud at the Mid Atlantic Rally!

Link to post
Share on other sites


This topic is now archived and is closed to further replies.

  • Create New...

Important Information

We use cookies to ensure you get the best experience. By using our website you agree to our Cookie Policy