| Author | Message | ||
     Brian Brown (Rtiqulatendisco) New Member Username: Rtiqulatendisco Post Number: 14 Registered: 01-2004 |
I'm pulling my 3.9 out of my 95 D1 and putting in a 4.6. I have never attempted an engine swap and am looking for advice or thoughts on odd things that I may need to watch out for or problems that people have run into while doing an engine swap. I have access to a well equipped garage. Thanks for any and all advice. | ||
| Leigh Mikolajczyk (Leigh_m) New Member Username: Leigh_m Post Number: 26 Registered: 01-2004 |
Let me know how it goes because I will probably be doing the same to a 94 disco. Where did you get the motor? | ||
| Dave Smith (Javelinadave) Member Username: Javelinadave Post Number: 79 Registered: 07-2002 |
This is from the D-90 FAQ section. I hope it is helpful!..... www.D-90.com I am currently swapping a 4.6 into a 95 disco for a customer. I can tell you that the ancillaries will swap over with no problems but there are a couple of things to watch out for. Firstly, the rod bolts/counterweights may hit the oil pan--I had to dimple the pan for clearance. Secondly, the end of the crankshaft may be longer than the 3.9. I ended up fabricating a spacer to go on after the pulley/damper to space it all correctly. I am going to go with a 4.2 chip at this point. The basic block castings are the same, but the front covers use different gaskets. If you put in the wrong gasket you will either have a coolant leak or not build oil pressure--depending on which way you screw up. I do not think that the 4.6 camshaft is compatible with the distributor drive. You will need a cam from a 95 3.9 or 4.2 that will mount the distributor drive gear and is machined for the cam retaining plate used on newer engines. The retaining plate is not required but it helps control cam knock (camshaft tapping against block--intermittent knocking noise at idle--won,t cause a problem but freaks some people out if it gets loud enough). All of the fuel injection components bolt up and according to the parts books the 4.6 uses the same injectors as the 4.0 so injector capacity should be adequate. As the block castings are all basically the same, you can bolt this engine into any Rover and hang the original ancillaries onto it. The main difficulty is crankshaft length. The original 3.5/3.9 engines with the external oil pump had fairly short snouts. They were extended when they changed to single serpentine belts and crank driven oil pumps. The engine I swapped in was built from new 2000MY components and the crank appears to have been lengthened again for the Bosch injection equipped engines. As noted previously--a simple spacer to go on after the damper and take up the space is a workable solution. The engine that I installed came from a company in England called V8 Developments. It is a new 4.6 with 8.0:1 compression, extensive porting on intake and exhaust runners, heads are mounted with studs (ARP), double roller timing chain with a crank gear that gives cam timing adjustability. It is designed to work with the blower. The company that built it has a nice web site and they will sell individual pieces or complete engines. I really like the double roller timing chain. If you are swapping a larger engine into an early Classic, you may have to change the ECU. The 13CU and 14CU computers may not have the capacity to run a larger engine and the early 14CUX computers had soldered in PROMs which preclude changing the chip. The harnasses and hardware and sensors were basically the same for all of these cars, so simply plugging in a 14CUX ECU into an older car will work fine (and the diagnostics are better too!). If you do this, get the ECU for a D-90 as there are minor differences concerning the functioning of the A/C and the D-90 ECU will provide the outputs required in an old(87-88) Classic. Putting a 4.6 into a 97 D90 would be really simple with no fitment issues at all. Happy Swapping Dave | ||
| Brian Brown (Rtiqulatendisco) New Member Username: Rtiqulatendisco Post Number: 16 Registered: 01-2004 |
Thanks Dave. I think that I have all that covered. The front cover is off a 4.2 and the cam is off a 3.9 with the spacer. The engine is complete so my questions are more directed at the actual install of the engine as opposed to making sure the engine is properly set-up. I'm a little worried about wiring. Also, since the engine is complete, will there be any gaskets or seals at all that I might need after pulling the 3.9? Essentially, what is the hardest part I can look forward to during this swap? Thanks Leigh, I got a low milage engine off a guy in FL. I didn't want to mess with a rebuild using a 4.6 short block. | ||
| Dave Smith (Javelinadave) Member Username: Javelinadave Post Number: 80 Registered: 07-2002 |
Where are you located? |
