A/C compressor mount

petercz · Sep 28th, 2020, 11:08

I have a problem with lower a/c compressor mounting bolts (b230fk engine), they always snap after few months. I replaced them maybe five times yet... what could be wrong?

Laird Scooby · Sep 28th, 2020, 12:18

Quote:

Originally Posted by petercz

I have a problem with lower a/c compressor mounting bolts (b230fk engine), they always snap after few months. I replaced them maybe five times yet... what could be wrong?

Try tightening them to the specified torque instead of tighteneing them until they (or you) creak!

That bolt looks like it has sheared through being over tightened but also check the belt is running in line and not at an angle and all other bushes/brackets/mounts for the compressor.

TonyS9 · Sep 28th, 2020, 12:19

I have no experience of this bolt, but the lack of problem from others siggests you are doing something wrong. Over tightening? Belt tension adjustment after tightening?

petercz · Sep 28th, 2020, 12:34

I tightened it just by hand and normal wrench and I´m really not that strong

belt was adjusted etc...

360beast · Sep 28th, 2020, 16:21

Is the wrench you are using 12 foot long?

Check the rubber mounting bushes aren't misshapen, they are always squashed on ones I break.

mhuk · Sep 28th, 2020, 20:38

Belt allignment and or bushes shot. My alternator did the same.

petercz · Sep 28th, 2020, 22:07

Nah just normal 20cm wrench :teeth smile:
A/c compressor is hard mounted without rubber bushes... I will take a look at the alignment again.

Laird Scooby · Sep 28th, 2020, 22:18

Quote:

Originally Posted by petercz

Nah just normal 20cm wrench :teeth smile:
A/c compressor is hard mounted without rubber bushes... I will take a look at the alignment again.

That's the problem, you're using a metric wrench on it - try using an 8" instead!

On a slightly different thought process, have you been using the A/C and if so, any unusual noises with it?
If so, try not using it for a few weeks and see if the bolt lasts longer. I'm wondering if the compressor has a fault and that's causing a "snatching" effect on the belt. Might be enough to shear the bolt if so.

360beast · Sep 29th, 2020, 11:44

Quote:

Originally Posted by petercz

Nah just normal 20cm wrench :teeth smile:
A/c compressor is hard mounted without rubber bushes... I will take a look at the alignment again.

Yes the rubber bushes deform and throw the alignment out. Mine kept chewing through alternator belts so I have fitted polybush mounts.

petercz · Oct 5th, 2020, 08:25

So the geometry seems to be fine. When I´m not using the a/c, I think bolts really last longer. But otherwise a/c is working fine without unusual noises etc... the compressor was rebuild and basically all parts of the system were replaced during last years

Sep 28th, 2020, 11:08	#1
petercz Member Last Online: Apr 16th, 2024 16:58 Join Date: Aug 2011 Location: CZ	A/C compressor mount I have a problem with lower a/c compressor mounting bolts (b230fk engine), they always snap after few months. I replaced them maybe five times yet... what could be wrong? __________________ '96 850 R, B5234T5, AW42-50LE \| '89 764 GLE, D24TIC, ZF 4HP22 '97 944 Turbo, B230FK, M90 (145kW/330NM - Vialle LPi, BTI chips, 16T@0.8bar, 3"DP+2,5"cat-back, wasted-spark, DO88 IC, Bilstein B6, lowered, dual-sways...)

Sep 28th, 2020, 12:34	#4
petercz Member Last Online: Apr 16th, 2024 16:58 Join Date: Aug 2011 Location: CZ	I tightened it just by hand and normal wrench and I´m really not that strong belt was adjusted etc... __________________ '96 850 R, B5234T5, AW42-50LE \| '89 764 GLE, D24TIC, ZF 4HP22 '97 944 Turbo, B230FK, M90 (145kW/330NM - Vialle LPi, BTI chips, 16T@0.8bar, 3"DP+2,5"cat-back, wasted-spark, DO88 IC, Bilstein B6, lowered, dual-sways...)

Sep 28th, 2020, 20:38	#6
mhuk Senior Member Last Online: Mar 1st, 2024 08:41 Join Date: Mar 2009 Location: London	Belt allignment and or bushes shot. My alternator did the same. __________________ Volvo 940 19T, Charge cooled, Chipped.

Sep 28th, 2020, 22:07	#7
petercz Member Last Online: Apr 16th, 2024 16:58 Join Date: Aug 2011 Location: CZ	Nah just normal 20cm wrench :teeth smile: A/c compressor is hard mounted without rubber bushes... I will take a look at the alignment again. __________________ '96 850 R, B5234T5, AW42-50LE \| '89 764 GLE, D24TIC, ZF 4HP22 '97 944 Turbo, B230FK, M90 (145kW/330NM - Vialle LPi, BTI chips, 16T@0.8bar, 3"DP+2,5"cat-back, wasted-spark, DO88 IC, Bilstein B6, lowered, dual-sways...)

Oct 5th, 2020, 08:25	#10
petercz Member Last Online: Apr 16th, 2024 16:58 Join Date: Aug 2011 Location: CZ	So the geometry seems to be fine. When I´m not using the a/c, I think bolts really last longer. But otherwise a/c is working fine without unusual noises etc... the compressor was rebuild and basically all parts of the system were replaced during last years __________________ '96 850 R, B5234T5, AW42-50LE \| '89 764 GLE, D24TIC, ZF 4HP22 '97 944 Turbo, B230FK, M90 (145kW/330NM - Vialle LPi, BTI chips, 16T@0.8bar, 3"DP+2,5"cat-back, wasted-spark, DO88 IC, Bilstein B6, lowered, dual-sways...)

Sep 28th, 2020, 12:19	#3
TonyS9 Premier Member Last Online: Apr 9th, 2024 21:44 Join Date: Jul 2009 Location: Holywood	I have no experience of this bolt, but the lack of problem from others siggests you are doing something wrong. Over tightening? Belt tension adjustment after tightening?

Sep 28th, 2020, 16:21	#5
360beast Go redblock or go home Last Online: Today 01:01 Join Date: Feb 2012 Location: UK	Is the wrench you are using 12 foot long? Check the rubber mounting bushes aren't misshapen, they are always squashed on ones I break.

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