77 motor in a 73 vw bus

[weaselx]

I have a 77 type 4 engine to go into my 73 type 2 bus, and what do I need to do to make it work wiring and otherwise. Im 18 years old and starting to get into Volkswagens and don’t know a ton of wiring just looking for some help

[timvw7476]

one thing is stud length, the bottom ones. Those transaxles, '73 & '77 take a different length bottom stud, both sides, when you go to mate engine to transaxle.

Also is the '77 complete with it's fuel injection system. That's a world away from the 1973 dual carb set up & dual vacuum distributor, and the 'perch' needed for the fuel injection airbox.

Work & more work. edit: there's also the double relay needed for fuel injection, & the 'slot' for the Bosch computer, near the battery.

[busdaddy]

Picture time, lets see what you are working with.....
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[Wildthings]

The bellhousing, clutch-flywheel, and starter all need to match. You need to go with either an all '72-'75 set or an all '76-'79 set.

[weaselx]

Clutch, flywheel and starter is right. My dad helped with that. I have a progressive 2bbl carb or the fuel injection but I thought I would use the carb for now because of funds at the moment. Good idea or bad? I’ve never wired anything so I really need help with that part. I don’t know what goes to where.

[Wildthings]

Remove the complete FI system from the '77 and box it up well so nothing gets lost. Then just dress the '77 engine out just the way the '73 engine now is. Piece by piece, wire by wire. You may or may not want to stick with the '77 exhaust.

[weaselx]

When I first got the car it didn’t have an engine or transmission in it so me and my dad had to source them both, we put both the engine and the transmission in the bus correctly but I need to know how to wire the engine for it to run just can’t seem to figure out what goes where.

[Wildthings]

You have to have power from the ignition switch to the ignition coil and maybe power to an electric choke and to an electric fuel pump if you are running one. You also need to wire up the alternator if you are missing the harness, new ones can be had from VW specialty shops and are the way to go. You also need power from the #50 terminal on the ignition switch to the #50 terminal on the starter solenoid, the big B+ wire from the battery to the lug on the solenoid also needs to be in place.

You must have a ground strap going from the transmission to the frame or the engine to the frame and from the negative post on the battery to the body.

I suspect that most of these wires are already there as most they with the body when the engine is removed.

[Hodence]

My best recommendation would be to find a complete wiring diagram for your engine. If you need a new harness, I did a similar engine swap a couple of years back and went with a Wolfsburg West Wiring harness. The quality was phenomenal and they included a full wiring diagram that ended up being my bible for the following 8 months. If you could find both a diagram from 73 and 77 you could compare and get the best idea of what you're going to have to improvise.

[rayjay]

You need the factory Bentley manual which will have the wiring diagram for the 73. You need to identify and tag the following wires,
IGN coil positive
Choke
Oil pressure sender
Alternator field exciter
Starter solenoid

[rayjay]

You will need a 12 volt test light and a multimeter would also be handy.