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id_gwagen
Date registered: Dec 1899
Location:
Vehicle(s):
| Propshaft shortening questions (swap M110 to 617a)
Dear all,
This is regarding my engine swap project from M110 to 617a.
As I've had the engine and gearbox up on the chassis, It turned out that the propshaft from the gearbox needed to be shortened by about 10cm (~4 inches). The length of the propshaft (pushed all the way in) is about 30cm (12inches) from flange to flange, my concern is after it is shortened there will be very little play which I'm not sure it'll cause vibration or not.
Has anybody had the experience of shortening the propshaft from 280GE (4-speed manual gbox) to accomodate A/T box? I would appreciate if you can share it here.
Cheers,
Chairil.
Edited by id_gwagen 4/4/2007 1:45 PM
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Loki Laufeyjarson
Date registered: Apr 2006
Location: 66°N, 19°W
Vehicle(s):
| RE: Propshaft shortening questions (swap M110 to 617a)
I had the middle drive shaft shortened when I changed to 617.
It was done by a driveshaft specialist who shortended it on both sides. The main concern is to awoid burning the teflon coating of the slip joint when welding.
I I remember correctly the flange to flange distance was about 27 cm
I recomend you to take a close look at the mounting rubbers of TC and engine. Eaven more important is to have the right mount hight on the gearbox mount. If that is not right the G will rattle like vibrator...
Loki |
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id_gwagen
Date registered: Dec 1899
Location:
Vehicle(s):
| RE: Propshaft shortening questions (swap M110 to 617a)
Thanks Loki, that's a very valuable input. We have a very good driveshaft specialist down here, I'll warn them about those things to look out for and see what they have to say about it. Yes you might be right about the propshaft being 27cm, I only measure it with my thumb and pointer finger by stretching it that's about 10cm :-D
Just wondering, do you remember how much 'play' left with the shortened propshaft (in/out)? My mechanic is concern about bolting the tcase flange not having enough room to manuver.
Chairil. |
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Loki Laufeyjarson
Date registered: Apr 2006
Location: 66°N, 19°W
Vehicle(s):
| RE: Propshaft shortening questions (swap M110 to 617a)
If the rubber mounts of engine, gearbox and TC ar ok, there is very little play of the drag link.
I guess that 1,5 cm shortening is well above limit.
I remember some German link on BW that had some photos.
Loki |
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Inkblotz
Expert
Date registered: Apr 2006
Location: Georgia
Vehicle(s): 90 300GD "Thundering Turtle II", w/ 603A turbo
Posts: 3186
| RE: Propshaft shortening questions (swap M110 to 617a)
There was mentioned before in this forun or BW that there needs to be a bit of play in the slide joint of the shaft (real name?) so that when the TC moves it does not push the shaft against the other end but instead just slides in and out a bit. In other words if the shaft is too long the 2 halfs will bang against each other
Hope this is clear.
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hus55
Expert
Date registered: Apr 2006
Location: north cyprus,lapta.
Vehicle(s): 300GDS, G300 LONG,300GDT CLK55 AMG CAB.
Posts: 2230
| RE: Propshaft shortening questions (swap M110 to 617a)
hi,i had the front prop shaft on my 230GE 4-speed cabrio shortened when i had a w124 300d engine fitted.
it wasnt done by a prop specialist,but the result was fantastic  |
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hipine
Date registered: Jul 2006
Location: US, CO, Bailey
Vehicle(s): 460 1980 280GE w. 617A
| RE: Propshaft shortening questions (swap M110 to 617a)
If the prop shaft "operating length" is approx 15-20mm greater than the fully collapsed length, you'll be fine in this application. In other words, if the distance from the trans flange to t-case flange as the components sit in the car, was 30 cm, I'd make the drive shaft approximately 28.5 cm when fully compressed. If yo udon't like the 15mm number, you can get the one the factory used because you can see the marks on your old shaft where the seal was riding. Push the halves together until fully compressed, then pull them apart until the seal lines up with the wear mark on the mating half. Te difference in lengths is the number to substitute for the 15mm above. If you are able to slide the two halves together and apart without removing the grease fitting, that slide is pretty worn out and you'd be better to have a new DS made as vibes can be right there in the slider if it's worn out. -Dave G. PS - see also something here about the source of alignment-induced vibration when changing gearbox length. http://69.9.37.142/disc/forums/showthread.php?tid=6617&posts=12&highlight=transmission&highlightmode=1#M67543
Edited by hipine 4/4/2007 6:52 PM
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id_gwagen
Date registered: Dec 1899
Location:
Vehicle(s):
| RE: Propshaft shortening questions (swap M110 to 617a)
hipine - 4/4/2007 5:46 AM
If the prop shaft "operating length" is approx 15-20mm greater than the fully collapsed length, you'll be fine in this application. In other words, if the distance from the trans flange to t-case flange as the components sit in the car, was 30 cm, I'd make the drive shaft approximately 28.5 cm when fully compressed. If yo udon't like the 15mm number, you can get the one the factory used because you can see the marks on your old shaft where the seal was riding. Push the halves together until fully compressed, then pull them apart until the seal lines up with the wear mark on the mating half. Te difference in lengths is the number to substitute for the 15mm above. If you are able to slide the two halves together and apart without removing the grease fitting, that slide is pretty worn out and you'd be better to have a new DS made as vibes can be right there in the slider if it's worn out. -Dave G. PS - see also something here about the source of alignment-induced vibration when changing gearbox length. http://69.9.37.142/disc/forums/showthread.php?tid=6617&posts=12&highlight=transmission&highlightmode=1#M67543
Yes that's really my concern Dave, the thing is that I have to shorten a total of 10cm, that means 5cm on one half, and 5cm on the other, now will I be able to retain that 15-20mm play, I guess that is the question. I'll see what the specialist has to say about it, those guys have done many 'strange' modification for 4x4 customers.
Chairil. |
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