AW71 Vibrating in seccond gear

Yezzz · 06-23-2021, 05:02 AM

Since I have swapped a B230FK with an AW71 in my 244, I have severe vibrations in seccond gear. Especially under load.
The engine pretty much stock, running +-0.5 bar boost and the transmission has the accumulator mod and the IPD overdrive solenoid bypass installed.

I bought the transmission untested but was told it came out of a running and driving car.

2 old for this · 06-23-2021, 08:43 AM

Ever since I swapped all of the drive train in my Bertone there has been a shudder when you start to move. I think my torque arms are to blame. Yours my be the drive shaft support.

linuxman51 · 06-23-2021, 10:06 AM

it's unlikely to be the transmission internals causing the vibration, it's more likely to be a driveshaft balance issue or driveshaft support issue. (also make sure the engine isn't torqueing over enough to cause contact elsewhere in the driveline)

lummert · 06-23-2021, 11:09 AM

Was the flywheel (or flex plate) removed from the engine during the trans swap? Is yes, verify that it is installed correctly.

Yezzz · 06-24-2021, 07:19 AM

Quote:

Originally Posted by lummert

Was the flywheel (or flex plate) removed from the engine during the trans swap? Is yes, verify that it is installed correctly.

It was removed but to my knowledge it has been installed like it should. Can you even mount it wrong and stull have a running engine? Since the ecu needs the correct signal?

Quote:

Originally Posted by linuxman51

it's unlikely to be the transmission internals causing the vibration, it's more likely to be a driveshaft balance issue or driveshaft support issue. (also make sure the engine isn't torqueing over enough to cause contact elsewhere in the driveline)

The enginemounts are fresh diesel mounts so it ist moving that much. You might be right on the driveshaft part. I got it seperated when I bought the 4 speed so it might be misaligned.

Is there any way I could confirm someting like that?

2 old for this · 06-24-2021, 09:08 AM

Rear shaft front joint must mirror front shaft rear joint.

hiperfauto · 06-24-2021, 02:57 PM

Think of the front half of the shaft as though it didn't have a slip joint. The yokes must be aligned like the rear half. When assembled, the yokes on the front half should be offset 90° from the rear half. You can still be 180° off so if you still have a vibration try the other way.

Look closely, some of the shafts have an arrow stamped into them. If so, align the arrows.

Yezzz · 06-25-2021, 01:48 AM

Quote:

Originally Posted by hiperfauto

Think of the front half of the shaft as though it didn't have a slip joint. The yokes must be aligned like the rear half. When assembled, the yokes on the front half should be offset 90° from the rear half. You can still be 180° off so if you still have a vibration try the other way.

Look closely, some of the shafts have an arrow stamped into them. If so, align the arrows.

I had been on the lookout for alignment arrows. Sadly I could find them. Ill try flipping the rear half this weekend, thanks for our input!

06-23-2021, 05:02 AM	#1
Yezzz Newbie Join Date: Jun 2016 Location: The Netherlands	AW71 Vibrating in seccond gear Since I have swapped a B230FK with an AW71 in my 244, I have severe vibrations in seccond gear. Especially under load. The engine pretty much stock, running +-0.5 bar boost and the transmission has the accumulator mod and the IPD overdrive solenoid bypass installed. I bought the transmission untested but was told it came out of a running and driving car.

06-23-2021, 10:06 AM	#3
linuxman51 BRANDSCHUTZVORSCHRIFTEN! Join Date: Dec 2002 Location: mont, AL	it's unlikely to be the transmission internals causing the vibration, it's more likely to be a driveshaft balance issue or driveshaft support issue. (also make sure the engine isn't torqueing over enough to cause contact elsewhere in the driveline) __________________ "They bum rushed them in their own crib, they drank all their beer, they partied with their ladies and they left with the trophy" Now with in-house Dyno tuning! Megasquirt Tuning!

06-23-2021, 11:09 AM	#4
lummert Board Member Join Date: Jan 2008 Location: Portland IN	Was the flywheel (or flex plate) removed from the engine during the trans swap? Is yes, verify that it is installed correctly. __________________ Trying to understand stupid people is like trying to pick up a turd by the clean end.

06-24-2021, 02:57 PM	#7
hiperfauto The Librarian Join Date: Nov 2011 Location: So Cal	Think of the front half of the shaft as though it didn't have a slip joint. The yokes must be aligned like the rear half. When assembled, the yokes on the front half should be offset 90° from the rear half. You can still be 180° off so if you still have a vibration try the other way. Look closely, some of the shafts have an arrow stamped into them. If so, align the arrows. __________________ 240 Alcantara Shift Boot Cover (164 & 72- 140 too) Rare, Race & R-Sports Parts Colored B/S Brake Hoses 140/160 and more Volvo Advertising Stuff -

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06-23-2021, 08:43 AM	#2
2 old for this Board Member Join Date: Mar 2018	Ever since I swapped all of the drive train in my Bertone there has been a shudder when you start to move. I think my torque arms are to blame. Yours my be the drive shaft support.

06-24-2021, 09:08 AM	#6
2 old for this Board Member Join Date: Mar 2018	Rear shaft front joint must mirror front shaft rear joint.