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Old 05-16-2018, 03:09 PM
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Drillbit Drillbit is offline
Join Date: Oct 2005
Location: Glasgow Ky
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I sold a customer a 3.9 out of a 90 RRC with V belts. He is trying to install it in a 95 Disco with serp belts. I told him he would need to use his old front cover and a spacer. He was cool with that. I had that backwards, you have to use a spacer to put a serp belt engine in a v-belt truck. When he tried to put the front cover on the crank is 1-2 inches short and doesn't have a key way. Is there a work around for this? Is he (and by extension me) just screwed?
Marty Powell
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Old 05-16-2018, 03:34 PM
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ERover82 ERover82 is offline
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Complementary crank for swap? Not easy, but neither is shipping engines.
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Old 05-16-2018, 04:37 PM
robertf robertf is online now
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Location: Dallas
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I don't know if it will work. Obviously the keyway slot will need to be lengthened and the key replaced with the correct type.

Is he using the 3.9 balancer, or a 4.0/4.6? 3.9 is bolt together and has timing marks, 4.0 is one piece no timing marks. The bore depth is deeper on the 3.9 for a shorter crankshaft.
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Old 05-16-2018, 09:59 PM
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fishEH fishEH is offline
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Location: Lake Villa, IL
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I'll have a serp '95 D1 motor for sale soon.
'98 D1 Trail Rig. Lockers and whatnot. Retired
'96 D1 Daily Driver. OME lift, 235/85/16 Toyo AT's.
'95 D1 Project Truck.
'94 D1 Too good to pass up. OME lift, 265/75/16 BFG AT's, Detroit/TruTrac, etc

Originally Posted by discostew View Post
No matter how hard you stir it you won't make chocolate ice cream out of a bucket of shit
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Old 05-17-2018, 06:39 AM
Join Date: Apr 2004
Location: Lexington, Va
Posts: 6,380
We have done several vbelt to serpentine belt conversions here. Somewhere during the Vbelt lifespan there was indeed a change in the keyway on the crankshaft. I am pretty sure it was 93.... on a 93/94 the swap is straight forward... Before that date not so straight forward.
Will Tillery


Last edited by WILL.TILLERY; 05-17-2018 at 08:49 AM.
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Old 05-17-2018, 11:31 AM
robertf robertf is online now
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from How to Power Tune Rover V8 Engines
On these engines 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-litre 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
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Old 05-19-2018, 08:09 PM
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4Runner 4Runner is offline
Join Date: May 2007
Location: Boise Idaho
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That was my experience during the conversion on a 4.2. I just needed to have the keyway lengthened and am using a longer key.
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