Originally Posted by B3MOG
ps. that's for a 1985 +8 inj. DB

Great year for a Plus 8, DB! Rare Vitesse engine, ported flowed heads, super stock cam.... Hardcastle believed it to be the most potent iteration of the Rover/LR stock engines until the 4.6s arrived and then the MMC used a restrictive fuel map on them that produced notably less bhp. than yours. (That can ve rectified by moving to a proper eprom .

But the later 3.9 sumps are much better. They are steel, easily repairable by an amateur. An inch (from memory) more clearance while adding an extra litre of oil capacity, which I found keeps the oil notably cooler. For these reasons, they are hard to find now and expensive when you do. https://www.britishautoparts.com.au/inc/sdetail/14983 I bought mine when they were 5 quid on ebay 20 years ago. I keep two per car because that allows me to remove the dented one, replace it instantly and bang out the dents in its brother.at my leisure.

Morgan did not switch to the later aluminum sumps when LR and other users of the engine did. If they had, there would have been a Roadster sump problem but much worse. The later stock LR sumps on the V8, cast aluminum, shatter when impacted. So they used the great 3.9 LR sump was used from at least 1990 to 2004. Some owners, rather than repairing their steel sump (takes a 2x2 and a hammer) send off for the wrong later sump. Below...a horrid thing

Sorry, I'm rambling.

These sump plugs are an odd size. ooo Owners don't bother to measure much because we all buy the specific plug. So I thank you for your info. Officially, thread size/pitch is supposed to be 20.5mm (13/16") with 14 TPI (threads per inch) also known as BSW (British Standard Whitworth). The current part number 603659.Most suppliers will sell it with the crush washer noted, though buying a single crusher washer at a time makes no sense.

Lorne

.[Linked Image]