engine swap 3.5 to 3.9 - Land Rovers Only

Corbit · 10-08-2006, 07:10 PM

Hey all. I have a 87 RRC with the 3.5. For some resone my motor is only reading less than 50 PSI on all 8. It ran before I parked it, NOT NOW !! I have fuel to the rail , spark at the coil and to the plugs, timing is sat 6 BTDC with the rotor pointing at #1. Could my timing chain have jumped on me ?
I have another rover it is 91 with the 3.9 in it , it runs nice but the tranny is shot. Would it be a direct swap tp put the 3.9 in ? Does anyone know where I can find a write up ? Or online manual ?
I really liked this Rover , but this motor problem is kicking my butt ,any thoughts ? Thanks Corbit.

p76rangie · 10-08-2006, 09:25 PM

The motors are a direct swap. No need for any instructions as they are the same for both motors. The fuel injection systems may be different, but whatever system you use will still bolt onto either motor.

Ian

Paul Grant · 10-09-2006, 04:18 AM

Your best bet is to pull the EFI harness from the '91 along with the motor. That way you can use the 14CUX ECU from the '91 in your '87. You'll get a much better injection system and the ability to read codes when you run into problems.

Corbit · 10-09-2006, 09:31 AM

Thanks for the responce's , I think putting the 3.9 in will be the way to go. I still dont know why my compression is reading so low , the motor ran OK , didn't smoke.

Corbit · 10-10-2006, 12:47 PM

good news , the compression tester was bad . Comp is up 150 PSI , but still no run. I have replaced the inherta switch , and ecu. I have fuel to the rail , I'll check fuel pressure today.

10-08-2006, 07:10 PM	#1 (permalink)
Corbit Member Join Date: Oct 2006 Posts: 11 Gallery: 0	engine swap 3.5 to 3.9 Hey all. I have a 87 RRC with the 3.5. For some resone my motor is only reading less than 50 PSI on all 8. It ran before I parked it, NOT NOW !! I have fuel to the rail , spark at the coil and to the plugs, timing is sat 6 BTDC with the rotor pointing at #1. Could my timing chain have jumped on me ? I have another rover it is 91 with the 3.9 in it , it runs nice but the tranny is shot. Would it be a direct swap tp put the 3.9 in ? Does anyone know where I can find a write up ? Or online manual ? I really liked this Rover , but this motor problem is kicking my butt ,any thoughts ? Thanks Corbit.

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10-08-2006, 09:25 PM	#2 (permalink)
p76rangie Ian Matthews Join Date: Jan 2006 Location: Melbourne Australia Posts: 1,914 Gallery: 0	The motors are a direct swap. No need for any instructions as they are the same for both motors. The fuel injection systems may be different, but whatever system you use will still bolt onto either motor. Ian

10-09-2006, 04:18 AM	#3 (permalink)
Paul Grant Senior Member Join Date: Jun 2005 Location: CT Posts: 846 Gallery: 0	Your best bet is to pull the EFI harness from the '91 along with the motor. That way you can use the 14CUX ECU from the '91 in your '87. You'll get a much better injection system and the ability to read codes when you run into problems.

10-09-2006, 09:31 AM	#4 (permalink)
Corbit Member Join Date: Oct 2006 Posts: 11 Gallery: 0	Thanks for the responce's , I think putting the 3.9 in will be the way to go. I still dont know why my compression is reading so low , the motor ran OK , didn't smoke.

10-10-2006, 12:47 PM	#5 (permalink)
Corbit Member Join Date: Oct 2006 Posts: 11 Gallery: 0	good news , the compression tester was bad . Comp is up 150 PSI , but still no run. I have replaced the inherta switch , and ecu. I have fuel to the rail , I'll check fuel pressure today.

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