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Over the past two days I noticed a slight clunk when starting from a stop sign / stop light. It wasn't consistent. I drove the car for a day trying to isolate the cause. I could feel a slight kick in the clutch pedal near the top of the engagement. I drove left and right turns trying to see if it was suspension related and did not appear to be (no clunks when turning). It was noticeable whether I started in first or second gear.
Fast forward to last night driving home "BOOM" in second gear I heard and felt a big "crash" under the car and lost all forward momentum. If it was a traditional front transmission car with a driveshaft, I'd say it felt just like a U-joint gave way, but there's no U-joint in the torque tube.
The engine still runs fine and the car seems to shift into all the gear so I don't THINK its a transmission failure, but not sure.
So...she's being towed this morning to my favorite 928 indy shop for a diagnosis. Any guesses?
My guess is that it will be obvious once you get eyes on it, but I'd start with the torque tube clamps/pinch bolts front and rear. Then I'd check the clutch components, torque tube bolts, bell housing bolts. That's several guesses I suppose. I'd think the transmission would give you progressive clues before just crapping out, but that's just a guess too.
Snapped drive shafts are [sadly] somewhat common on automatics but on manual transmission cars somewhat rare I would say but it seems you have all the signs of such..
Over the past two days I noticed a slight clunk when starting from a stop sign / stop light. It wasn't consistent. I drove the car for a day trying to isolate the cause. I could feel a slight kick in the clutch pedal near the top of the engagement. I drove left and right turns trying to see if it was suspension related and did not appear to be (no clunks when turning). It was noticeable whether I started in first or second gear.
Fast forward to last night driving home "BOOM" in second gear I heard and felt a big "crash" under the car and lost all forward momentum. If it was a traditional front transmission car with a driveshaft, I'd say it felt just like a U-joint gave way, but there's no U-joint in the torque tube.
The engine still runs fine and the car seems to shift into all the gear so I don't THINK its a transmission failure, but not sure.
So...she's being towed this morning to my favorite 928 indy shop for a diagnosis. Any guesses?
It shifts into all gears AND moves still?....if not I’d say the torque tube shaft snapped but that’s more of trait of automatic trans cars.
Splines chewed off of clutch intermediate shaft ends. (I felt compelled to propose something other than the obvious drive shaft or 1/2 shaft breakage.)
Well, I got the car on the lift at the shop this morning. First of all, its relatively good news - nothing too major. And I realize there is a missing clue I didn't even think of until I saw what happened. About 9 months ago I replaced all four CV boots. It looks like on the drivers side inner CV joint I must've not adequately torqued those bolts (no one to blame but myself) . Looks like the bolts backed out until there was just one left, which sheared off. Made one hell of a racket under the car.
The only real damage was to the inner CV joint and the flange that bolts to the transmission. I have an email into 928 INTL to take advantage of used parts pricing for the Thanksgiving-Christmas sale.
Glad it wasn't anything too bad. I was already starting to price out transmissions.
Well, I got the car on the lift at the shop this morning. First of all, its relatively good news - nothing too major. And I realize there is a missing clue I didn't even think of until I saw what happened. About 9 months ago I replaced all four CV boots. It looks like on the drivers side inner CV joint I must've not adequately torqued those bolts (no one to blame but myself) . Looks like the bolts backed out until there was just one left, which sheared off. Made one hell of a racket under the car.
The only real damage was to the inner CV joint and the flange that bolts to the transmission. I have an email into 928 INTL to take advantage of used parts pricing for the Thanksgiving-Christmas sale.
Glad it wasn't anything too bad. I was already starting to price out transmissions.
You are not the first one to do that and doubtless not the last one either!
Yeah I had that happen on the road once. Bang bang bang as I hit the brakes and dove for a side street.Luckily all the bolts were there and I just needed to re-torque them.
Still got a ride home on a tow truck. And I do check those every year or so now.
This is easy to fix
Please dont buy a used CV /half shaft.
928 Intl sells new refurbished half shafts with new CV joints for about 300 per side.
Boom done
11-27-2019, 07:58 AM
Guess the catastrophic drivetrain failure.
