4.6 / 4.0 swap
- Thread starter SMLE
- Start date
Don't think so. I'm pretty sure they read "0.40"...
Been working the 4.0 on the stand. Pulled the 4.0 front cover off and the 4.6 front cover seems to fit, however, also need to swap over the 4.6 oil pan to the 4.0 due to the elongated bolt pattern of the 4.6 front cover.
To limit upfront expenses on this experiment, I'm going to leave the 4.0 heads on for now just to see if this will work, which means I have to swap over the head covers from the 4.6 to the 4.0, which seem to fit okay. I'll have to deal with the SAI system errors temporarily.
If it works, I'll go ahead and buy a set of head gaskets, etc... and finish swapping the heads over too.
In the process of swapping over the 4.6 intake manifold and ignition system. Fun!
Thanks for the info guys. It is a great help.
I have everything swapped over to the 4.0 block. Most everything lined up pretty good.
However, I see what you all were talking about with the crank position mount issue...
Best way to change that out looks to be to cut the welds holding the back side of the mount to the block, replace with a 4.6 mount and reweld...
Anybody know an easier way? I don't have a spare 4.6 mount at the moment. It's still in the 4.6 block that's up at the shop to see if it can be saved.
However, I see what you all were talking about with the crank position mount issue...
Best way to change that out looks to be to cut the welds holding the back side of the mount to the block, replace with a 4.6 mount and reweld...
Anybody know an easier way? I don't have a spare 4.6 mount at the moment. It's still in the 4.6 block that's up at the shop to see if it can be saved.
I believe Peter used a gems block in a Bosch vehicle and just redrilled the mount. But he's in the UK and has a 5 speed and I think the sensors might be different.
You know, re-reading through posts is a good idea.
Dang that is useful info, thanks!
Guess I didn't really know what you guys were talking about until I really got into the project.
Out of stock at Atlantic British, but will keep looking.
Yes, that is the best way. You can also epoxy it in place, but I wouldn't recommend it considering the amount of work to fix it if the epoxy fails.
I finally acquired the 4.6 crank position sensor mount and should have it installed in the 4.0 block by sometime next week.
I will be finishing bolting on the front cover and oil pan before hand and am wondering if it would be a good idea to take the oil pump assembly apart prior to that and pack it with Vaseline. It was working just fine on the 4.6 prior to taking the front cover off that block.
Don't want to disassemble something that was working previously, if I don't have to.
I will be finishing bolting on the front cover and oil pan before hand and am wondering if it would be a good idea to take the oil pump assembly apart prior to that and pack it with Vaseline. It was working just fine on the 4.6 prior to taking the front cover off that block.
Don't want to disassemble something that was working previously, if I don't have to.
No, thank you for reminding about that.
I did some reading on that topic and seems like it will run without changing the gear, but the engine will not quite feel right...
Can I basically just swap out the cam gear and timing chain assembly from my 4.6 to the 4.0 block?
Experiment to see if this will get me back on the road as inexpensively as possible while I ponder what to do with the 4.6 block.
The 4.0 motor is finally in the Rover... Just have to hook up all the attachments.
One problem I ran into was that it appears my welding job on the Crank Position Sensor mount wasn't perfect.
The mount went in and lined up on the pin just fine, so I thought I was good to go, but the heat shield won't fit correctly.
At this point, I'm hoping the crank position sensor, being in the ball park of where it supposed to be, will accurately sense the flywheel.
I also discovered that the knock sensors are different. Having to source the sensor mount studs (part #LYR100740).
Everything else has matched up pretty good.
One problem I ran into was that it appears my welding job on the Crank Position Sensor mount wasn't perfect.
The mount went in and lined up on the pin just fine, so I thought I was good to go, but the heat shield won't fit correctly.
At this point, I'm hoping the crank position sensor, being in the ball park of where it supposed to be, will accurately sense the flywheel.
I also discovered that the knock sensors are different. Having to source the sensor mount studs (part #LYR100740).
Everything else has matched up pretty good.
That is exactly what we found. The cylinder wall behind the sleeve on number 5 has a very large crack.
Got a quote for around $1,000 to resleeve all eight cylinders, plus cost to rebuild...
I'm going to go with the 4.0 that seems to be working for now. Just have to iron out the cooling system issue.