HYDRAULIC ENGINE MOUNTS

  • Thread starter Thread starter John Robertson
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John Robertson

How do you test the hydraulic engine mounts ?.Mine seemed to be bad due to
my fan scrapping the cowling of the radiator .So I replaced the engine mount
under the turbo on my 740 .Trouble is the mount felt ok in the hand, but now
the engine seems smoother so how do I tell if the other side the left hand
side from behind the steering wheel ,is ok?
Can they collapse and or expand ?My fan is still not central in the cowling
..It went when I was running hard, but legal on a twisting long road with a
Saab Turbo for company .So it was under pressure.Thankfully it was a simple
job .I removed the left hand ?good side?and it felt ok ,I think .
 
John Robertson said:
How do you test the hydraulic engine mounts ?.Mine seemed to be bad due to
my fan scrapping the cowling of the radiator .So I replaced the engine
mount under the turbo on my 740 .Trouble is the mount felt ok in the hand,
but now the engine seems smoother so how do I tell if the other side the
left hand side from behind the steering wheel ,is ok?
Can they collapse and or expand ?My fan is still not central in the
cowling .It went when I was running hard, but legal on a twisting long
road with a Saab Turbo for company .So it was under pressure.Thankfully it
was a simple job .I removed the left hand ?good side?and it felt ok ,I
think .
Click to expand...
If I'm not mistaken you have the standard non-hydraulic mounts. The one on
the intake side of the engine may not be in such bad shape because it is
spared the added heat from the exhaust system, but it probably is not in
good condition. Besides hardening, they can soften and deform; that is clear
by looking at it. The same applies to the common failure mode where one end
shears off the rubber center.

You've already changed the hardest one. I think you would be well to replace
not only the other side mount, but the rear mount above the tail of the
transmission. That one is easier yet, although it is valuable to have a
floor jack free to remount the cross-member it attaches to. The rear mount
also has the highest failure rate and is most likely to cause the engine to
sit crooked.

Mike
 
John said:
How do you test the hydraulic engine mounts ?.Mine seemed to be bad due to
my fan scrapping the cowling of the radiator .So I replaced the engine mount
under the turbo on my 740 .Trouble is the mount felt ok in the hand, but now
the engine seems smoother so how do I tell if the other side the left hand
side from behind the steering wheel ,is ok?
Can they collapse and or expand ?My fan is still not central in the cowling
.It went when I was running hard, but legal on a twisting long road with a
Saab Turbo for company .So it was under pressure.Thankfully it was a simple
job .I removed the left hand ?good side?and it felt ok ,I think .
Click to expand...


Engine mounts should be replaced in pairs, they're only about $6 each
online anyway.
 
James said:
Engine mounts should be replaced in pairs, they're only about $6 each
online anyway.
Click to expand...

Hi all,

I wonder if someone would post the symptoms of bad engine mounts,
hydraulic or otherwise.

What would one be hearing or feeling that would make them say "ahaa, I
think I might have an engine mount problem"? (or something to that effect).

Thanks much,

Perk (:>)
 
Perk said:
Hi all,

I wonder if someone would post the symptoms of bad engine mounts,
hydraulic or otherwise.

What would one be hearing or feeling that would make them say "ahaa, I
think I might have an engine mount problem"? (or something to that effect).

Thanks much,

Perk (:>)
Click to expand...


If they get bad enough, the fan will rub on the cowl. If the car has a
manual transmission, you'll start to see excessive movement of the
shifter as you accelerate and slow down.
 
I noticed on my wifes turbo excessive play in the shifter and replaced the
auto gear box mount errrr up side down .After putting it the right way
around it was ok .I have my blond days .By the way where I was running hard
the speed limits were way way too high so it was legal and fun on a deserted
road .Its a worry when you see such high posted speeds ,you wonder if some
kid will try to take the corners at the posted speed in the wet or black ice
or even the dry .
 
My fan did touch the radiator cowling
John Robertson said:
I noticed on my wifes turbo excessive play in the shifter and replaced the
auto gear box mount errrr up side down .After putting it the right way
around it was ok .I have my blond days .By the way where I was running hard
the speed limits were way way too high so it was legal and fun on a
deserted road .Its a worry when you see such high posted speeds ,you wonder
if some kid will try to take the corners at the posted speed in the wet or
black ice or even the dry .
Click to expand...
 
John said:
I noticed on my wifes turbo excessive play in the shifter and replaced the
auto gear box mount errrr up side down .After putting it the right way
around it was ok .I have my blond days .By the way where I was running hard
the speed limits were way way too high so it was legal and fun on a deserted
road .Its a worry when you see such high posted speeds ,you wonder if some
kid will try to take the corners at the posted speed in the wet or black ice
or even the dry .
Click to expand...


It's not difficult to check the mounts, usually when they fail, they
break. Put a jack under the bellhousing with a block of wood to protect
it and jack it up, if the engine or transmission lifts up off any of the
mounts, they're bad.
 
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