Thread: How to tell if my disco has a 3.5l or 3.9l

Originally Posted by tuff disco

Hi everyone I just brought a 1992 swb disco and the guy told me it has the 3.9l motor in it how can I tell if it does or not, thanks in advance

Engine number + Google ?

number of drive belts for fan a/c etc is usually a good guide, 3-4 is likely a 3.5, just a single multi rib belt is likely a 3.9

others will tell you it is not that simple, but its near enough

Look up the engine number here Rover V8 Engine Numbers

Originally Posted by jazzaD1

number of drive belts for fan a/c etc is usually a good guide, 3-4 is likely a 3.5, just a single multi rib belt is likely a 3.9

others will tell you it is not that simple, but its near enough

Disco 1s 3.9s from about Oct 93 to May 94 had fan belts and 3.9 RRC had fanbelts for even longer so the chance of a 3.9 having belts rather than a serpentine is reasonable.

Go by engine number.

Originally Posted by jazzaD1

number of drive belts for fan a/c etc is usually a good guide, 3-4 is likely a 3.5, just a single multi rib belt is likely a 3.9

others will tell you it is not that simple, but its near enough

When we fitted a stroked (5.0L) 3.9 to a 93 discovery we swapped it back to V-Belt as it allowed more accessories to be reconnected (Endless air etc).

Thanks for the help everyone, this is the first forum of many I have been with and the help is exceptional

My 97 disco 1 has a big 3.9 stamped on the intake

Originally Posted by garrycol

Disco 1s 3.9s from about Oct 93 to May 94 had fan belts and 3.9 RRC had fanbelts for even longer so the chance of a 3.9 having belts rather than a serpentine is reasonable.

Go by engine number.

i have a 1995 discovery 3.9 with serpentine belt if thats help