Thread: 93RRC 3.9 into 98 Disco 1 3.9 possible ?

You can knock the crank sensor mount out of the 98 block and chemiweld it in place on the 93 block.

Im 99% sure the 4.0/4.6's with the sepentine front cover have a longer crank snout (hence the need too run a space behind the pully when running the multi bet front end on the later blocks)

Im 99% sure the 4.0/4.6's with the serpentine front cover have a longer crank snout (hence the need too run a space behind the pulley when running the multi bet front end on the later blocks)

Yep and the earlier crank does not have a long keyway to fit the oil pump to so it involves removing and modifying.
Autos both 22s.

Will it be as simple removing all the front end drive gear from the 98 D1 3.9 and fitting it up to the RRC 3.9 .? (it appears so !!)

NO As above no because all RV8s are BACKWARD compatible not Forward compatible as they couldn't afford to employ clairvoyant engineers, the cheapskates.

Regards Philip A

Ah so !!!
So perhaps the only real modification needed is to Cut down , or indeed space out the D1 harmonic and pulleys to suit the 93RRC crank , if thats possible !!! ??
If the outer seal and inner shaft diameters are the same ? And to fit a CRS point to the back of the Block ?
Also , if they were both ZF22's then the old RRC had the Borgy , and the D1 98 had the Lt230 , a straight swap maybe ??

So perhaps the only real modification needed is to Cut down , or indeed space out the D1 harmonic and pulleys to suit the 93RRC crank

Huh?
The point is that the V belt crank does not have a long enough keyway to fit the oil pump gear on to the end of the crank so you cannot fit the newer front with crank oil pump unless you lengthen the keyway in the crank, which is AFAIK a crank out job.( or fit the later crank and a set of bearings).

Des Hamills book 'How to Power Tune Rover V8 Engines says on P18

"On these engines(interim 3.9/4.2) the crankshaft nose(sometimes referred to as the 'snout') was the same length as on all previous engines, but the key/keyway was longer.An early 3.5 3.9 or 4.2 engine's crankshaft key was long enough to drive the new crank driven oil pump, but was not sufficiently long to also engage an "interim" engine's crankshaft damper keyway."
Regards Philip A

Dont know if we are getting this backwards
The deal is to fit a 93RRC 3.9 into a 1998 D1 .
Ok , all is well , it is only the Thor , coil pack engines that have the Longer snout , the oil pump/serpentine thing is irrelevant , the Harmonic balancer will come straight off the D1 98 3.9 and fit straight onto the the 93RRC crank / timing case . All the D1serpentine driven accessories will bolt straight back up on the 93RRC block exactlty the same as the D1 . (Just dont try it on a D2 4 litre , then all you do is fit a 20MM spacer inside the the balancer !) still have to fit a CRS though.

Does your current engine have a crank driven oil pump?

The 93RRC has the side gear , dizzy driven ,oil pump as they all did , the 1998 D1 3.9 has the Crank driven gerotor oil pump as they all did .It appears that only the 4litre or D2 onwards 3.9/4.0 litres have the extended snout on the crank .. so sayeth Uncle Kev , so Ill check them out !

disco engine has the crank driven pump hence the need for the 20mm longer crank, so i think you'l find the original comments about the 93's crank snout being too short are correct