differences between 79sd and 82cd motor

[lutzTD]

will a motor from a 79SD work in my 82 300CD? is there any difference in any components that I would need to swap or can I drop it right in?

Thanx

[chasinthesun]

I only know that you cant use a 300d for a 300cd ,the gear is different ,not sure on a 79 300sd .If you can look at them and count the teeth of the gear then youll be golden.

[charmalu]

The 79SD and the 82 300CD use a 617 engine. I believe the 79 is a few less HP, and you might have to change the motor mount arms and a few things from the 82 engine.

I don`t understand the gearing statement. what gear, flywheel? should be the same, thing the starter would all fit.

If it`s the Diff gears, that will make no difference in the engine.

Charlie

Looked up the Wike info
617.950 110 HP W116
617.951 125 HP W126
617.952 125 HP W123
http://en.wikipedia.org/wiki/Mercedes-Benz_OM617_engine

[vstech]

IIRC, the oil canister is different.
if there's any differences on flywheels, just keep your original flywheel.

[mespe]

Is the 300CD a turbo?

If it's a non turbo, might have some exhaust work to do, And hope you plan on swapping the entire engine, dif IP's between turbo and non

[lutzTD]

Originally Posted by charmalu

The 79SD and the 82 300CD use a 617 engine. I believe the 79 is a few less HP, and you might have to change the motor mount arms and a few things from the 82 engine.

I don`t understand the gearing statement. what gear, flywheel? should be the same, thing the starter would all fit.

If it`s the Diff gears, that will make no difference in the engine.

Charlie

less HP..... bummer I need every pony I can get

I was thinking the oil canister and motor mounts but wasnt sure. anything else major. I got a line on a 160K motor

[lutzTD]

Originally Posted by mespe

Is the 300CD a turbo?

If it's a non turbo, might have some exhaust work to do, And hope you plan on swapping the entire engine, dif IP's between turbo and non

cd is a turbo

[compu_85]

The W116 engine will not have EGR.

[vstech]

how's the cam in your CD? only difference between the HP's is the cam profile.

[lutzTD]

Originally Posted by compu_85

The W116 engine will not have EGR.

perfect, I stripped that stuff of my 82 the second day

[lutzTD]

Originally Posted by vstech

how's the cam in your CD? only difference between the HP's is the cam profile.

cd runs like a scalded dog, other than the balancer and alternator it has been a very trouble free great running engine. It has around 280K on it though so I would hesitate to swap the cam. Im thinking of getting a crank and doing a full stand rebuild at some point.

[charmalu]

The SD 116 doesn`t have the EGR, true, but you can swap over the non EGR manifolds to the later engines.

Don`t know if you saw this, time it took to looked it up and posted there were 5 more replys.

Looked up the Wike info
617.950 110 HP W116
617.951 125 HP W126
617.952 125 HP W123
http://en.wikipedia.org/wiki/Mercedes-Benz_OM617_engine
__________________

160 mile engine, does make since to swap it in. strip it down to the long block, and swap over your CD engine parts. swap in the cam etc....
then keep the old engine and go through it.

It`s the nose of the crank that is screwed up, right? plenty of 617 engines in the yards to get a crank from. just saw a 85 300SD cali 216K in the yard last week.

Charlie

[SirNik84]

not sure your mechanical skill level, but if you are comfortable undertaking this project, then I would suggest Frankensteining the engines together. I do believe the HP gains in the later 617 engines were in the cam and the head. You could just swap the head off your 82 engine onto the 79 engine, keep the 79 intake and exhaust because those are nice. you'll have to swap over the oil filter housing anyway. looks like you might wanna shop for an engine stand

Sounds like with the 79 engine you have all the parts to make a nice engine.

[kerry]

I believe the only difference in the oil filter housing is an electric gauge on the SD and a manual guage on the CD. Housing itself is the same.
Vacuum pumps will be different. PCV hose will be different. SD will have a rod instead of a bowden cable. Temperature sensing for glow plugs is different between the two engines I think--meaning the relay is different.

[lutzTD]

yeh Im thinking its not worth the effort right now for 15HP. the vacuum pump difference worries me. Will the coupe vacuum pump work? Bowden cable is gone with the manual swap.