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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Power steering pump seized?Views : 583 Replies : 12Users Viewing This Thread : |
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#1 |
ericbeaumont
Last Online: Apr 22nd, 2024 19:38
Join Date: Oct 2004
Location: London
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Trying to identify a light grinding noise and a chemical burning smell from the front of the engine. It appeared after a routine 40-mile drive, during which the engine ran smoothly, steering was normal (no squealing) and temp gauge vertical.
When parking last night I discovered the start of the noise - constant light grinding. This morning I needed to move the car up the street to work on it, and the noise increased. It didn't want to turn over or start after that. Opened the bonnet and smelled the slight acrid burning; no obvious sign of the source. Took the water pump off - it's had a slight leak at the top for a while, and I decided to do the job (again) and put on an SKF with a Volvo seal this time. While the belt was off I tried (out of suspicious curiosity) to turn the power steering pulley by hand, and found it was exceedingly difficult, turning slowly in jerks but only with extreme effort; turning either way was equally hard. Having googled a bit and discovered that power steering pumps should turn freely without the belt, my guess is that the bearings failed abruptly. PS oil is up to level; car is a 1997 945 on 122,000 miles. I'd appreciate advice to confirm this analysis. Last edited by ericbeaumont; Dec 8th, 2021 at 22:08. |
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#2 |
Go redblock or go home
Last Online: Today 15:06
Join Date: Feb 2012
Location: UK
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Sounds like your pump is definitely dead!
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#3 |
ericbeaumont
Last Online: Apr 22nd, 2024 19:38
Join Date: Oct 2004
Location: London
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#4 |
Senior Member
Last Online: Aug 30th, 2023 18:22
Join Date: May 2015
Location: Fordingbridge
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The donor engine Luke fitted for me came with a PAS pump which was monumentally shafted. I've always assumed that it's down to over-tight drive belts or like any bearing just some contamination. 120k isn't too bad.
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'93MY Volvo 940SE 2l Petrol Manual non-a/c "Valhallarama" |
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#5 |
Go redblock or go home
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#6 |
Premier Member
Last Online: Today 14:23
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Location: Stowmarket
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Talking of over tight belts, have been trying to find guidance on checking tension, but Haynes mentions absolutely nothing.
Can recall back in 80's when working on various cars the manuals used to give amount of deflection, and where to take this measurement from?? Cheers Steve |
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#7 | |
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Last Online: Today 12:42
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Location: Lakenheath
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The poly-v belts (flat with ribs) should be much tighter so you can twang them like a bass guitar string and if you're musically talented, play the opening riff of Smoke on the water. Over-tight V belts can cause bearing failure on water and PAS pumps, alternators etc. Also if a car has been laid up, the bearings can Brinnell and deteriorate but usually they are noisy before seizing. When i say noisy, i have a clutch bearing on my AC compressor on my other beast and it sounds like a noisy supercharger now! ![]()
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#8 |
Senior Member
Last Online: Aug 30th, 2023 18:22
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Location: Fordingbridge
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Laser sell a belt tension checker if you want to get really geeky about it
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'93MY Volvo 940SE 2l Petrol Manual non-a/c "Valhallarama" |
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#9 | |
Premier Member
Last Online: Yesterday 18:50
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Location: Lenzie
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V70 D5 SE Geartronic 215bhp Saville Grey 2012MY 940 LPT Manual 1996 740 SE 1990 |
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#10 |
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Last Online: Today 14:23
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Location: Stowmarket
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Thanks for information re belts, i always used to go on circa 1/2" deflection on longest run, so will go with that.
Think thumb measuring device will suffice, at least you can't misplace it, well, assuming you don't get it trapped in running belts ![]() Just noticed PAS belt getting really out of shape the other day when I was first looking at exhaust leak, flapping around like a mad thing. Also had squeal for first 5 seconds after starting, should be picking 3 new belts up with all my exhaust leak parts , so will do asap, tensioners look to be partially seized, so more copious applications of penetrating oil over the next week. Cheers Steve |
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