Engine rotation

1st_Volvo · Post by **1st_Volvo** » 31 Jan 2012, 05:49

Should the engine rotate while the foot is on the brake and switching gears between R-N-D? I observed this while my son was in the car and I was observing the engine. The engine rotated (I'm guessing here) about 5 degrees each way with each change in gears.

Thanks.

Post by **jimmy57** » 31 Jan 2012, 06:15

That sounds a bit too much. Two lower engine mounts on that fore-aft located member below engine are the motion control. They do not hold up engine, the ones holding engine are the front and the one on top of transmsission.
If the motion is more on the front of engine(passenger side as mounted in the car) then the front mount may be more the problem than the two below engine. The ones below engine are easy to inspect.

Post by **regent** » 31 Jan 2012, 06:36

+/-5 deg tilt looks like a lil' more than 'normal behaviour' even with the original (non-modified) mounts. Do you notice any clunks or excessive vibration?
Engine and tranny mounts would last up to 80 kmiles depending on driving habits. It is usually the upper torque bracket (mount) and the transmission mount that fail first (inexpensive and pretty easy to inspect and replace); the lower mount - at the right side wheel is next. The hydraulic mounts (front and back of motor) usually do last pretty long; do not bother if you don't see a leak.
What usually happens is that when one mount fails, the one on the opposite side would begin to wear relatively quicker due to excessive stress.
You can search the posts on motor mounts for your MY; let us know if you need diagrams or procedures. I'll be glad to help further.

Post by **jimmy57** » 31 Jan 2012, 08:38

the 4 cylinder S40/V40 uses a totally different mount arrangement than the P2 or 800 platforms. They do not have an upper torque mount with engine sitting on lower mounts. They use pendulum mounting at front and rear of engine/trans unit with torque restraint below.
5 degrees would be about 1 inch and I think that is more than normal. I would suggest actually gauging the motion at top of engine and seeing if it exceeds 3/4 inch when put in gear (1 1/2 inch total for D and R).
The engine is allowed to move more than you may have noticed on some vehicles as that is the way to reduce the 4 cylinder buzzies from being felt so much in the car.

Post by **regent** » 31 Jan 2012, 10:01

Please pardon my confusion with P2 - I assumed wrong.
Reading makes life easier... sometimes

Thanks jimmy57 for pointing this out.

Now on another note, would it make sense to do a transmission relearn (reset TCM adaptives and relearn) after changing mounts?)
Thanks

Post by **jimmy57** » 31 Jan 2012, 10:49

The relearn is only needed for repairs that affect the shifting between gears. Engaging gears is not a function subject to the adaptive process of TCM. Engagement can be harsh when the linear solenoids on the 5 speed valve body have worn bores and when there is a fault where the TCM enters failure management mode and does not control line pressure. When this occurs the line pressure is at maximum value of a relief valve and not controlled by TCM regulating a pressure controlling solenoid. The high pressure makes gear engagements feel like a car just tapped your front or rear bumpers.

Post by **regent** » 31 Jan 2012, 14:43

Thanks for the insight, very helpful!

1st_Volvo · Post by **1st_Volvo** » 31 Jan 2012, 19:41

Yes, there is a pretty good clunk when I shift from park to reverse or neutral to drive. Also there is a good amount of vibration felt while driving.

I sure could use some procedures and part names that I can order.

Thank you so much. This is good stuff!

rhlee222 · Post by **rhlee222** » 04 Feb 2012, 17:06

Hi Everyone,
I'm a brand new member here. I have the same issue with my 2001 S40. I noticed excessive vibration, clunking and motor rotation. After close inspection, I found that both bottom mounts, front and rear, are worn out. I would really appreciate some advice replacing these. These cost $71.00 each at my local Volco dealer.

Thanks much,
Rick

1st_Volvo · Post by **1st_Volvo** » 06 Feb 2012, 09:45

I took the car to a local (non Volvo) shop and had them check the engine and transmission mounts. The report is that they are all wore out and need to be replaced for a meer $1300 (ouch). I think I'll try doing it myself. Anyone have the part numbers I need and procedures for replacing?

Much appreciated!!!