ryan10

well, my motor is junk. bearings in the lower end are gone. the truck is a 93 1 ton 4x4. i am getting a motor out of an 89, complete 300k runs great for $450. how hard is it to swap one of these motors? i have swapped chevy 350s and all that. what has to be done to swap a cummins? will there be any differences between the 89 and 93? i know the 89 wont have an intercooler. can i bolt my 93 intercooler on it?
any input is appreciated.
thanks.

wannadiesel

Swap the vacuum pump/power steering pump, all the bracketry on the driver's side, the injector lines and clamps, the intake horn, the thermostat housing, and the fan from the '93 onto the '89 motor and it should drop in like it grew there.

Sounds like a good price on the '89. If you can afford it, change the head gasket while you have it out of the truck. 300k is about when they start to blow just from age. Also kill the KDP and replace the rear main seal.

ryan10

ok, where is the vacuum pump located? so i should just leave the injector lines and clamps in the truck and hook them up to the new motor? when i do all this will the intercooler bolt up or no?

rbrettctd

Intercooler will bolt up, you just need to flip the intake plate (the 12 or so bolt plate under the intake horn), and swap the water neck for the thermostat from your 93 as the 2 different models had different radiators.

ryan10

Ok, thanks. can somebody get me a picture of the intake plate and horn? Also, are the vacuum pumps different from the 2 different years? because the motor i am getting will have the vacuum and power steering pump attatched. should i just disconnect the injector lines and clamps from the injectors, then hook them up to the new motor?

wannadiesel

Yes, you just need to change the lines and the clamps that go with them. The '89 lines won't fit around the intake horn. Leave the injectors alone, the '89 has bigger injectors. While you've got both engines sitting on the ground, change all the parts I posted in my first post. Much easier than doing it with the engine in the truck.

wannadiesel

Also, if your '93 is an automatic you might have to change injection pumps so the TPS will work.

ryan10

Ok, can anybody tell me if i will have to deffidently change the injector pump? how hard is this to do?

rbrettctd

Actually the lines will fit, but thats it, just fit. Ive got a piece of rubber between my lines and the intake horn to prevent holes rubbing in them. BTW, does anyone have the Cummins number for the injector lines for intercooled models-Id feel more comfortable going to them, just as you should do since you have them ryan10.

wannadiesel

We can't tell you for sure without seeing the pump. If it is the original '89 pump you will need the '93 pump.

The late model pumps have a big hex recess in the middle of the nut that holds the throttle arm on, the hex drives the TPS. Unfortunately you can't just swap the throttle arms. Since you are changing the injector lines anyway it's only a few more bolts, not a huge deal.

rainfade

Or run the 89 pump and wire a pot in place of the tps I think I saw a how to in the sticky in fact.

sdstriper

Any thoughts on keeping the 89' injector lines? I believe they are bigger, bigger ID. I have seen some pretty good home made intake horns that couldn't have cost over $25 bucks to make or have made...

wannadiesel

I'd just swap the '93 ones on. Larger lines wouldn't matter unless he was pushing a lot of fuel.

ryan10

Ok, where do i disconnect the injector lines? from the injectors and where else?
This is the part i am confused about.

rbrettctd

the injector lines run from the injectors to the injection pump. Look at the back of the pump, this is where the term 'rotary pump' comes in as the lines are in a circle on the pump. Just take them loose in the 2 spots and any braces that are supporting the lines along their route.