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300GD - New engine or rebuild?

Joined
May 3, 2011
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Pretoria
#1
Hey there guys

My bigend bearings on my 300gd went, so we pulled out the engine and stripped it to see what was the problem. Luckily a friend helped me and we could strip it the right way.

So now all the problems:
1: The head was burnt in above the cylinders, and hopefully it can be fixed
2: Bearings was in their glory, so i have to replace them and get the crank cut, but the problem is it was already cut, so if it has to be cut too much, I won't get the right size bearings, and the whole operation is pointless, and then I need to buy a new crank as well, and still more!
3: If i wanted to put in a new engine, where do I start searching and what options do i have with the standard gearbox?

Any suggestions would be much appreciated and if the necessary parts I might need is just lying around and one of you would be interested in selling them, I am very interested.

thank you all, hopefully you guys have some better options as I am very "moedeloos"!!
 

Alan

G-Wagen Club SA
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#2
Re: New engine or rebuild?

Hey Franna,
Sorry to hear, I think your quickest and cheapest option is to source a used (hopefully from a known source and condition of motor) motor. There might be some from forum members.
 
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#4
Re: New engine or rebuild?

I am trying to phone 4aces, but it is either busy or they don't answer! I cant take that! But ill rather go there! What would be a good price to pay for a new engine, and what do I look for without opening it up?
 

Pete460332

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#5
Re: New engine or rebuild?

There are 4 undersizes for that crankshaft - surely they can't all be "used up". What do you mean by the head being burnt?

You should be able to source a used 300D engine from a scrapyard or better still find a W123 300D car for sale ( should get a decent one for 8-15K ) - at least you will be able to test the donor engine and then sell the rest of the car off.

peter
 

Alan

G-Wagen Club SA
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#6
Re: New engine or rebuild?

You should be able to source a used 300D engine from a scrapyard or better still find a W123 300D car for sale ( should get a decent one for 8-15K ) - at least you will be able to test the donor engine and then sell the rest of the car off.

peter
I agree with Peter, this will most probably be cheaper than getting the old engine redone. Having said that the new "old" engine is still that old but could be good for may k's
 
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#7
Re: New engine or rebuild?

I finally got a new engine, paid a deposit and is fetching it at the end of the month.

Do you think I should keep my old diesel pump as I think mine looks a bit better than the one I am buying, because I heard to replace them is a (female dog)!

Cant wait though, I miss driving Rommel so much!
 

Pete460332

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#9
Re: New engine or rebuild?

You will have to move the flywheel accross. One should rebalance the crankshaft with new flywheel but I would take a chance , put the old flywheel in the same way it came out. You will also have to put a pilot bearing in the crankshaft - auto's don't come with a pilot bearing
peter
 
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#10
Re: New engine or rebuild?

hey there, going to pick up my new old engine today, then I have to work on it a bit. Does anyone know where I can get a new clutch plate other than MBSA, as they quoted me R3300.

Mine is still ok, but while my engine is out, why not make it better than OK.
 

Andrew

G-Wagen Club SA
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#12
Re: New engine or rebuild?

I bought a new clutch plate from MB for about 900 not more than 6 months ago.

LUK also lists a replacement.
 

Pete460332

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#14
Re: New engine or rebuild?

I thinks its the same as an early W123 250 petrol - take your plate to a clutch shop and they could confirm it with you
Peter
 

460LeoG

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#15
Re: New engine or rebuild?

You should be able to source a used 300D engine from a scrapyard or better still find a W123 300D car for sale ( should get a decent one for 8-15K ) - at least you will be able to test the donor engine and then sell the rest of the car off.

peter
Ive done exactly that 2 years ago and is a worthwile exercise. Bought a 123 300d for R3000, removed engine, gearbox, and some bits and pieces that are the same on those, then sold the body on wheels for R1200. (just out of interest)
 

rat

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#16
Re: New engine or rebuild?

Hi,
I am Paul, I have original engine 300GD in good condition with brand new Cilinder Head.
Rebulid was done 50.000km ago (including pump and injectors). Price R6000.00

My contact number-cell: 0834621646
 

460LeoG

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#17
Re: New engine or rebuild?

Reason for selling? I may be interested. Transport may just be prohibitive.... With clutch, flywheel, starter motor, alternator??
 

Andrew

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#18
Re: New engine or rebuild?

Is the LUK a good replacement?
Look this brand is very well trusted but it certainly did not work for me mounted behind the 300 turbo diesel (which is still not a fabulously powerful engine). The springs shattered in the plate itself. I am not a very hard driver either.
 
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#19
Re: New engine or rebuild?

Thank you rat, i wished you offered me the engine a while back as i already bought a new old engine and you would have saved me a lot of trouble.
I am busy exchanging parts from my old engine with the new one as some of them is not ideal for the g and others just look better on the older engine.
So now I have a few problems.

1: Meter at the back/bottom of the oil-filter housing (Red Arrow). My old engine's one doesn't fit and isn't on the same position as the new one. Can I exchange the plates by loosening the bolts (White arrows) and just swapping them?

New Oil filter housing.JPG Old Oil filter housing.JPG

2: The pipes going from the oil filter to the oil radiator/condenser are not the same. The new engine's pipes go down and the old engine's pipes go higher (As indicated on the photo's). I like the fact that it goes lower, but the problem is it will give me problems with the engine mountings (white arrow). Can I exchange them by loosening the nuts (red arrows)

Old Oil pipes.JPG New Oil pipes.JPG

3: If you look into the thermostat housing, you see a lot of white stuff, "Kalk" I presume? I want to re-con my radiator and replace the thermostat with a new one, the problem is i am assuming there is a lot of this stuff in the head and block. should i start it up and then re-con the radiator or do you have any suggestions?

Thermostat housing.JPG

4: Lastly, my air-con pump sits on a bracket that is fixed at the engine mountings and the mountings for the altenater brackets. Now the problem: the old engine had bolts screwing into the block (white arrows) for the altenater brackets where the new one has "studs" or threaded bar coming out of the block (white arrows) making it impossible to bolt the bracket securely on, it does fit though, the bars coming out of the block is just too short to fit a nut over. Any suggestions?

Aircon bracket old.JPG Aircon bracket new.JPG
 

Andrew

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#20
Re: New engine or rebuild?

1. Yes you can swap the sender unit cover. Remember to seal it.

2. Change the pipes to the G configuration. Pipe damage can cost you an new engine.

3. That is aluminium corrosion and should not be in your rad and block also, but it seems time to flush the whole lot if it looks like that. You radiator might benefit from a good flush too and maybe you dont need a recore. If you have the cash you can only improve your lorry by putting in a new 4 tube rad. And then make sure to finish it off with a new MB pressure cap. Beware the thermostat can fit in two different ways - make sure it is a genuine MB one that is fitted correctly.

4. lock two nuts together on the exposed thread and turn out the stud as if it is a bolt. Replace with longer studs (1st prize) or bolts and use thread lock fluid when you replace. Use grade 8.8 bolts or harder that have a threadless shank for the part that goes through the mounting. Do NOT use threaded bar. There is a great bolt shop in the main drag of Silverton not far from you.

Good luck.