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#1
08-20-2014, 09:21 AM
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Driveline slop and noises
I'm really stoked that the W108 is firing up and running strong once it warms up. The Pertronix conversion is on order and I can't wait to throw it in and toss the points.
I want to turn my attention to the underside. I'm experiencing the following issues, probably a result of sitting since '86: 1) Some drive line vibration and a rattle noise from the trunk area. More pronounced in certain RPM ranges, under load and on the over-run. Clutch in and it disappears completely. Best way to describe it is to think of carrying a thick slab of sheet metal in the trunk that is rattling - combination of rattling with a grinding feel. 2) Manual tranny shifts hard once warm. Reverse crunchy unless I shift into a forward gear first - air in clutch line? 3) General sloppy feel in the drive line. Hard clunks in the trunk if I step on the gas hard. 4) Noisy valve train area even after valve adjustment. Pulls very strong and sounds like a party under the valve cover. Noise doesn't bother me, but want to ensure it's not a sign of trouble. What's the right way of tackling the driveline? The rattle/grind is driving me bonkers and really spoiling and otherwise fantastic driving experience. Flex disc *looks* ok and the center bearing has ~0.5 - 1 cm play if I put muscle into it. Cheers, Alex 
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#2
08-21-2014, 03:51 PM
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The center differential mount (the one in the front of the trunk)could be bad. I found mine really worn out and the real axle made a lot of noise as a result.
__________________
 Tony HW111 280SE 3.5 Coupe Manual transmission Past cars: Porsche 914 2.0 '64 Jaguar XKE Roadster '57 Oval Window VW '71 Toyota Hilux Pickup Truck-Dad bought new '73 Toyota Celica GT
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#4
08-21-2014, 11:26 PM
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It's been so long I can't remember. I'm sure the classic center has it-it's not an expensive part and very common.
__________________
Tony HW111 280SE 3.5 Coupe Manual transmission Past cars: Porsche 914 2.0 '64 Jaguar XKE Roadster '57 Oval Window VW '71 Toyota Hilux Pickup Truck-Dad bought new '73 Toyota Celica GT
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#5
08-22-2014, 07:02 PM
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Update: did a thorough inspection of the drive line. The transmission mount has completely disintegrated, causing the tranny to rattle against the cross member. There is no noticeable vertical play in the differential. The rubber part of the trunk mount is, however, resting on the washer. I'll replace the transmission mount as it's the most obvious problem and see how much slop and noise goes away. The flex disc and center carrier are OK.
I will also check the transmission output flange nut for looseness. Is a special socket necessary to tighten in?
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