Rover 4.2 cross bolted?

RiktheLogger · Post by **RiktheLogger** » Thu Sep 15, 2011 6:23 pm

Hi all,

Am I right in thinking a 4.2 Rover is cross bolted at the bottom end?

Looking at maybe taking one on with a split liner. Rebore and new liners?

Regards,
Rik.

softdash3.9 · Post by **softdash3.9** » Thu Sep 15, 2011 6:45 pm

I am pretty sure they aren't crossbolted

My Late '94 RR 3.9 V8 Classic it has a serpentine front end, pads for crossbolting, but no bolts

It did go porous

however and now has top hat liners

RiktheLogger · Post by **RiktheLogger** » Thu Sep 15, 2011 6:53 pm

Aye, the 3.9 was not cross bolted but if memory serves, the 4.0s and bigger were. Just wanted to confirm before I buy yet another dead project engine much to the dismay of my better half!!

softdash3.9 · Post by **softdash3.9** » Thu Sep 15, 2011 7:31 pm

Yes, the 4.0 and 4.6 are crossbolted as fitted to P38 2nd generation Range Rovers and beyond.

4.2 was fitted to Classic LSE only, in 2 variants std front cover and serpentine (with a distributor) as per my 3.9

RiktheLogger · Post by **RiktheLogger** » Thu Sep 15, 2011 7:37 pm

AHa!

Knew there was something like that! Thanks for that Royston, better put it on hold then! Akready got a 3.5 as a project so might just battle on with that.

Regards,
Rik

POAH · Post by **POAH** » Fri Sep 16, 2011 9:12 am

the intermediate 3.9 and 4.2s with the serp front end have the bits for cross bolting but need to be drilled.

SimpleSimon · Post by **SimpleSimon** » Fri Sep 16, 2011 9:45 am

POAH wrote:the intermediate 3.9 and 4.2s with the serp front end have the bits for cross bolting but need to be drilled.

And you will need the correct main caps to suit as they are not broad enough to meet the side of the crankcase

DEVONMAN · Post by **DEVONMAN** » Fri Sep 16, 2011 11:48 am

SimpleSimon wrote:
POAH wrote:the intermediate 3.9 and 4.2s with the serp front end have the bits for cross bolting but need to be drilled.
And you will need the correct main caps to suit as they are not broad enough to meet the side of the crankcase

Most 'interim' blocks have the correct mains caps for a crossbolt conversion, EXCEPT those made between Jan and April 1994 which have the earlier type caps.

Cheers Denis

SimpleSimon · Post by **SimpleSimon** » Fri Sep 16, 2011 12:16 pm

DEVONMAN wrote:
SimpleSimon wrote:
POAH wrote:the intermediate 3.9 and 4.2s with the serp front end have the bits for cross bolting but need to be drilled.
And you will need the correct main caps to suit as they are not broad enough to meet the side of the crankcase
Most 'interim' blocks have the correct mains caps for a crossbolt conversion, EXCEPT those made between Jan and April 1994 which have the earlier type caps.

Cheers Denis

That clears that one up then

don't you just love the RV8 variations

softdash3.9 · Post by **softdash3.9** » Fri Sep 16, 2011 4:57 pm

Here's a photo of my 3.9 Serp (38A ser No)

Std main caps not crossbolt (I fitted ARP main stud kit)

Wotland · Post by **Wotland** » Fri Sep 16, 2011 7:16 pm

Other pics of 3.9/4.2 38A blocks :