Junglie Posted March 5, 2023 Share Posted March 5, 2023 (edited) Hi all, Possibly the last stupid question for a while, not least because some overseas commitments for a few weeks... I've done a lookup on the 3.9V8 that I'm about to start fitting. Some might say it's a bit bloody late for that, but there you go. Apparently it came from an auto Disco. I have a flywheel, matching clutch and manual box, as well as all the EFI stuff. But is the original source vehicle going to cause me problems fitting it to my 110? Cheers Edited March 5, 2023 by Junglie Forgot the flywheel Quote Link to comment Share on other sites More sharing options...
Escape Posted March 5, 2023 Share Posted March 5, 2023 No problem, if you have the flywheel and clutch, as well as the bell housing and associated hydraulics you will be fine. The V8 doesn't care if it's mated to a manual or autobox, I've done the conversion a couple of times now. 😉 1 Quote Link to comment Share on other sites More sharing options...
ThreePointFive Posted March 5, 2023 Share Posted March 5, 2023 My 4.0 was from an auto and it made no difference other than the flywheel change. 1 Quote Link to comment Share on other sites More sharing options...
Junglie Posted March 5, 2023 Author Share Posted March 5, 2023 Thanks chaps - it was one of those "Oh...carp" moments. I am now suitably reassured. Just need to put it back together and find the time (Ha!) to get it into the truck now. Actually... any recommendations for a higher pressure oil pump while it's all in bits? Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted March 5, 2023 Share Posted March 5, 2023 Why do you need a higher pressure oil pump? Quote Link to comment Share on other sites More sharing options...
dave88sw Posted March 5, 2023 Share Posted March 5, 2023 Don't forget to fit a spigot bush! On that subject, i fitted a cheap britpart one and it squawked after 500 miles, had to take the gearbox out again to change it. I sourced a genuine new old stock one from p.a. blanchards and problem solved. Quote Link to comment Share on other sites More sharing options...
ThreePointFive Posted March 5, 2023 Share Posted March 5, 2023 2 hours ago, Bowie69 said: Why do you need a higher pressure oil pump? For the higher pressure oil of course! 😄 1 1 Quote Link to comment Share on other sites More sharing options...
Junglie Posted March 5, 2023 Author Share Posted March 5, 2023 3 hours ago, Bowie69 said: Why do you need a higher pressure oil pump? It's a fair question. My cousin has a variety of V8 powered MGs and he reckons they all dip perilously low on oil pressure when hot. I just can't get him to tell me which uprated pump he'd recommend because he's a bit difficult to get hold of sometimes... Quote Link to comment Share on other sites More sharing options...
Junglie Posted March 5, 2023 Author Share Posted March 5, 2023 1 hour ago, ThreePointFive said: For the higher pressure oil of course! 😄 Actually also a very good answer I was trying to think of a better one and failed miserably... Quote Link to comment Share on other sites More sharing options...
Junglie Posted March 5, 2023 Author Share Posted March 5, 2023 3 hours ago, dave88sw said: Don't forget to fit a spigot bush! On that subject, i fitted a cheap britpart one and it squawked after 500 miles, had to take the gearbox out again to change it. I sourced a genuine new old stock one from p.a. blanchards and problem solved. Great advice! Um...what's a spigot bush? And please don't say the bush around the spigot or I'll be forced to laugh. Quote Link to comment Share on other sites More sharing options...
western Posted March 5, 2023 Share Posted March 5, 2023 Fits in rear of crankshaft & supports the forward end of the gearbox input shaft the clutch friction plate slides on. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted March 5, 2023 Share Posted March 5, 2023 40 minutes ago, Junglie said: It's a fair question. My cousin has a variety of V8 powered MGs and he reckons they all dip perilously low on oil pressure when hot. I just can't get him to tell me which uprated pump he'd recommend because he's a bit difficult to get hold of sometimes... They can, isn't yours a serp engine? In which case you have a far better oil pump anyway, no need to upgrade at all. 3 Quote Link to comment Share on other sites More sharing options...
Junglie Posted March 5, 2023 Author Share Posted March 5, 2023 9 minutes ago, Bowie69 said: They can, isn't yours a serp engine? In which case you have a far better oil pump anyway, no need to upgrade at all. 2 belts - isn't that pre serp? I'm very happy to tskre guidance, and if I don't need to haemorrhage more money than I have to I'll take the win... Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted March 5, 2023 Share Posted March 5, 2023 If its not a fire-breathing V8 then you'll be fine with a stock early pump, just clean the faces as per workshop manual. 1 Quote Link to comment Share on other sites More sharing options...
smallfry Posted March 6, 2023 Share Posted March 6, 2023 The pre 1976 engines, Rover P5B, Rover P6, MGB V8, and early RRC had thinner (less high) oil pump gears. After the advent of the Rover SD1, all the vee belt engines had taller gears, to increase oil flow volume, and therefore pressure. Back in the day, the thing to do was to install a kit, which was basically a spacer, to enable fitment of the later wider gears. The oil pressure on the early engines was never great, even when they were new, down to nearly zero at hot idle, and this was thought to be the cause of camshaft, lifter, and rocker wear. The "high pressure" (actually high volume) kit made no difference to this. Later, a kit was produced with even taller gears. This produced a bit more pressure, but the downside is much increased loading and thus wear, on the distributor/oil pump drive gears. So IMO for what its worth, is don't bother unless its a high revving racing engine, in which case you will not be bothered about the gear wear, and constantly retarding ignition timing. Better solution is to use 20W50 or 10 or 20W60 oil on the vee belt engines. 2 1 Quote Link to comment Share on other sites More sharing options...
Junglie Posted March 6, 2023 Author Share Posted March 6, 2023 Thanks chaps, I'll do the recommended maintenance and save a few quid. Hopefully no fire breathing will be taking place... Quote Link to comment Share on other sites More sharing options...
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