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

I've just been through this.
Philip is spot on.

Once you take the timing covers and inlet manifolds off both your engines, the only difference you should see is that the keysteel is longer (and hence the slot it sits in, in the crank) on the serpentine block. The crank snouts are the same length as I understand it until you get to the 4.0L motor, and this was true for mine.

SO..to use your 93 motor with serpentine timing cover and ancilleries, you need to do what Philip says. Either have the slot in your '93 crank lengthened so you can fit the longer key steel, OR do what I did, and use the crank from the serpentine motor with the slot and keysteel at the correct length already. Obviously means new mains and big ends....don't mix those mains caps up between motors

On my driver side head, I also had to drill and tap a bolt hole for the serpentine alternator/aircon bracket, as it was blanked off on the older head from a V-belt motor.

One other thing is the cam. The 98 should have the retaining plate, and the 93 probably won't. I pulled a late 94 Disco serp motor apart (the first of the serpentines), and was very surprised to find NO cam retaining plate, and no bolt holes for one either. I don't know exactly when they were standard. But you will need to make a decision on whether you're happy to run the cam with no retaining plate and with the serp timing cover, or drill and tap to accommodate the plate, and get a new cam.

Cheers
Andre

Originally Posted by LRCounty

One other thing is the cam. The 98 should have the retaining plate, and the 93 probably won't.

No retaining plate on my 98 when I pulled it out last year!

Interesting LRCounty, but Im not wishing to change Timing cases and if the remaining snouts are still the same length then wheres the problem ? arrangements. ?(if thats possible ?)So it could come down to whether the pulley places the polydrive in the correct position.Then would the power steer/altenator/water pump/air-con all still line up ?
Also wondering why the actual polyV drive hub bolted to the Harmonic Balancer couldnt be simply exchanged for the double V belt drive pulley , if indeed the harmaonic balancer itself cant be used .
Think Ill get a 98D1 suffix B harmonic balance with its PolyV pulley up from Perth and compare it with the original 93RRC VBelt harmonic and Vpulley drive.and as Beeutey says ,measure them up ,I could just machine them up to fit !!

So you are going to use the v belt timing case with camshaft driven pump and put the multi rib accessories on? I just reread your original post and you did say that in a roundabout way. I just assumed you wanted to put the later timing case on the earlier motor as this is what most do.
So sorrreeeee ( as my daughter would say when forced)

Could work if all the brackets fit and you can machine a poly pulley to line up if it doesn't. Oil cooler lines may be a minor problem.
This approach is not the purist as the later oil pump is supposed to be much better.
We would not have had pages of this if you had added at the start " including the 93 timing case "
Regards Philip A

Of course the serpy bits may indeed be able to be grafted to the vee belt timing cover but remember, the water pump rotates the other way! You will need to figure out how to drive the vee belt pump c/w and reconfigure the belt to fit. Possible? Maybe but I doubt it.

Hey, you're living in the bush, how 'bout extending your keyway with a slitting wheel on your small angle grinder? A job for steady hands.

Well spotted Bee utey. I missed that one .
Email sent re vac.
Regards Philip A