gkm24 Posted August 4, 2011 Share Posted August 4, 2011 I am sure that this question has probably been asked before but here goes. I have a 1998 Disco V8 GS with a cracked block(Serpentine type). I have another V8 engine which is NOT a Serpentine engine. Is it possible to swap the crank etc from the Serpentine into the other block to effectively make it a Serpentine? I am going to Check/replace the mains and Big Ends in the other engine anyway and replace the cam for a TorqueMax so it will not be a major headache. Any help appreciated. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted August 4, 2011 Share Posted August 4, 2011 What are the two engines - shouldn't be a problem but a little more info on the patient & donor would be helpful. Quote Link to comment Share on other sites More sharing options...
gkm24 Posted August 4, 2011 Author Share Posted August 4, 2011 Sorry, Both engines are 3.9 Hotwire but cracked block engine is serpentine type. Just want to swap crank and other ftont end parts to make the other engine a serpentine. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted August 5, 2011 Share Posted August 5, 2011 You may not need to swap the crank, the nose length is the key - I know they changed on 4.0/4.6's but not sure how far back that applies. Where's Nige with his anorak when you need him? Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted August 5, 2011 Share Posted August 5, 2011 OK 3.9s were made both non serp on early ones and then serp later ones, serp is a better unit and also some early V 3.9s are not cross bolted blocks# 4.0s are ALL Serp, as are 4.6s, the 4.0 is really a 3.9, and all serps have the longer crank. You can't put a non serp crank into a serp block and then use the serp front end, the crank is too short and I have seen nasty horrible bodges to get around this - but never a good one SERP cranks can be swapped into a non serp block, and can then use either the serp or non serp front end, if you use the serp crank and a V belt front end then you'll need a spacer unit (get from RPI <shudder> ) to allow the V Belt pulley o bolt up onto the longer crank. a 4.0 & 4.6 timing cover / front end assemble is different to a 3.9 serp front end, do NOT try to mix and match (ask me how I know this ) but either fits the serp type crank and the pulleys are dished in / out so bolt end is the same Dims Lastly its really not a great idea tio swap cranks from one block to another without having it line bore checked, cranks really are matched to the blocks, just as the Mains end caps are, yes peeps will say you can swap a crank "No Problem" but I would pay a few quid and have it all checked Hope this helps, anoraks had a nice outing, maybe tommorow I'll take it to the beach Nige "The Anorak Admin ) Quote Link to comment Share on other sites More sharing options...
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