About to start swap: 617 to 617a in a g-wagen; need some reassurance and advice... - PeachParts Mercedes-Benz Forum

dr.no · #1 03-16-2020, 12:19 PM

So, a lot of posts mention that this is super easy. It must be, because all the detailed posts I find are about swapping in to gas-engined cars, or changing the transmission at the same time, or adding/subtracting A/C.

The car is a Norwegian-market 1986 300GD with an M-pump. The donor vehicle was a 1983 300SD
All I am doing is switching the engines, keeping the same Getrag 5-speed, radiator (which is no longer stock anyway), oil cooler, tach, etc. So far, what I anticipate is:

1. new exhaust diameter
2. either raising front bump stops or engine mounts (or moving forward 0.5 inches)

Not sure of:
1. how much linkage modification there will be
2. mating to transmission
3. modifying sump

Does the input shaft need to be trimmed? Reamed out for bearing? I think I have seen this in the past but can't find posts now...
I would replace the clutch plate and throwout bearing while in there, the rear seal if looks leaky. Anything else that should be replaced even if they good?
Which mounts would be best?

Also posted in pointed three.

Maxbumpo · #2 03-16-2020, 03:11 PM

Scott,

The donor engine is set up for automatic transmission (driven plate instead of flywheel) so you will need to deal with that. My understanding is that the plate / flywheel is balanced with the crankshaft, so you'll need to mark the orientation of the plate to the crankshaft (punch a jury mark on each), have a shop match the balance of the plate to the flywheel, and then install in correct orientation.

Yes you'll probably need modifications to the exhaust, use donor car parts.

I'm not sure why you think the engine mounting will be different.

Throttle linkage - again use parts from the donor car.

Mating to the transmission - may need to install a carrier bearing into the end of the crankshaft?

Oil sump differences - not sure about that, maybe you'll have to swap over the sump?