I think my 3.9 is a 4.0 Please help me id.
Rock Crawling
Joined: Mar 2007
Posts: 301
Likes: 1
From: DFW area, TX
RE: I think my 3.9 is a 4.0 Please help me id.
Or you could put in a rebuilt 4.6 block like this and get a few extra HP.
http://www.roverparts.com/Parts/9257F.cfm
http://www.roverparts.com/Parts/9257F.cfm
Camel Trophy
Joined: Feb 2007
Posts: 4,959
Likes: 11
From: Tulsa, OK
RE: I think my 3.9 is a 4.0 Please help me id.
ORIGINAL: Disco Mike
I think you will find, you can't do a 4.6 block switch with a 3.9 cause there is no drive gear set up for the distributor.
Mike
I think you will find, you can't do a 4.6 block switch with a 3.9 cause there is no drive gear set up for the distributor.
Mike
Thread Starter
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4wd Low
Joined: Jul 2007
Posts: 14
Likes: 0
RE: I think my 3.9 is a 4.0 Please help me id.
Well I certainly appreciate the helpful responses. I paid $1600 for the car knowing the engine was duff so I dont want to pay several thousand for a replacement engine. I would however like to find a good used engine as I understand they are generally very rugged. This will be a vehicle I need in the mountains, probably not a daily driver.
I am aware that a 4.0 engine does not have a gear to drive the distributor but as my present engine appears to have been modified, I know it is possible. Its just a matter of replacing the camshaft with a 3.9 one and then using the front cover from a 3.9 also, for the dissie. Then it seems a spacer is needed to get the crankshaft pulley to line up with the others.
So far I have not heard any technical/strength reasons why I should hold out for the 4.0 so I will probably look for a good 3.9.
thanks guys,
Steve
I am aware that a 4.0 engine does not have a gear to drive the distributor but as my present engine appears to have been modified, I know it is possible. Its just a matter of replacing the camshaft with a 3.9 one and then using the front cover from a 3.9 also, for the dissie. Then it seems a spacer is needed to get the crankshaft pulley to line up with the others.
So far I have not heard any technical/strength reasons why I should hold out for the 4.0 so I will probably look for a good 3.9.
thanks guys,
Steve
Rock Crawling
Joined: Mar 2007
Posts: 301
Likes: 1
From: DFW area, TX
RE: I think my 3.9 is a 4.0 Please help me id.
ORIGINAL: okdiscoguy
Mike, that link is for a Disco with a distributor. It is a drop in 4.6 block that has no liners. Made for 94-95 Discovery's
ORIGINAL: Disco Mike
I think you will find, you can't do a 4.6 block switch with a 3.9 cause there is no drive gear set up for the distributor.
Mike
I think you will find, you can't do a 4.6 block switch with a 3.9 cause there is no drive gear set up for the distributor.
Mike
If you couldcombine this block withsome sort of hi volume oil pump or even just start out & keeprunning good quality oil you'd probably have a bullet proof Rover motor here.
Rock Crawling
Joined: Mar 2007
Posts: 301
Likes: 1
From: DFW area, TX
RE: I think my 3.9 is a 4.0 Please help me id.
ORIGINAL: piper109
Well I certainly appreciate the helpful responses. I paid $1600 for the car knowing the engine was duff so I dont want to pay several thousand for a replacement engine. I would however like to find a good used engine as I understand they are generally very rugged. This will be a vehicle I need in the mountains, probably not a daily driver.
I am aware that a 4.0 engine does not have a gear to drive the distributor but as my present engine appears to have been modified, I know it is possible. Its just a matter of replacing the camshaft with a 3.9 one and then using the front cover from a 3.9 also, for the dissie. Then it seems a spacer is needed to get the crankshaft pulley to line up with the others.
So far I have not heard any technical/strength reasons why I should hold out for the 4.0 so I will probably look for a good 3.9.
thanks guys,
Steve
Well I certainly appreciate the helpful responses. I paid $1600 for the car knowing the engine was duff so I dont want to pay several thousand for a replacement engine. I would however like to find a good used engine as I understand they are generally very rugged. This will be a vehicle I need in the mountains, probably not a daily driver.
I am aware that a 4.0 engine does not have a gear to drive the distributor but as my present engine appears to have been modified, I know it is possible. Its just a matter of replacing the camshaft with a 3.9 one and then using the front cover from a 3.9 also, for the dissie. Then it seems a spacer is needed to get the crankshaft pulley to line up with the others.
So far I have not heard any technical/strength reasons why I should hold out for the 4.0 so I will probably look for a good 3.9.
thanks guys,
Steve
Rock Crawling
Joined: Mar 2007
Posts: 301
Likes: 1
From: DFW area, TX
RE: I think my 3.9 is a 4.0 Please help me id.
Hey yeah I wanted to ask you about them okdisco. Have you ever been to their place? I did order some used parts from them and they were good to work with and cheaper than most. I was wondering if you can go there and walk around their yard and browse, or do they not letpeople in the yard? I'd like to go up there one day from Dallas for a "shopping trip". (It would be like your significant other getting to go to mall of America LOL!)Also to look around and weigh up some ideas for mods I'm thinking about.
Camel Trophy
Joined: Feb 2007
Posts: 4,959
Likes: 11
From: Tulsa, OK
RE: I think my 3.9 is a 4.0 Please help me id.
I have tried to post a couple of times, but the DSL here keeps messing up.... I have not been, but hope to go soon. They have a shop there, and I think they will let you figure out wha you want. Not sure they will just let you walk around, though... I'll let you know after I get down there..
