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Post by beetOls on Mar 8, 2006 1:55:46 GMT 11
For quite some time now...whenever i turn on my a/c before leaving the garage/parking or when the engine is still cold, i hear this screeching sound from the engine bay...i have tried retightening the belts up to the point of having them replaced to no avail...i still have the problem now. i already had the a/c checked by an expert, including the pulleys, they're all ok...and by the time i get there, the screeching have gone away (usually after 10mins of driving, the screeching disappears). i don't hear the sound if i don't use the a/c. whenever this happens, there's also a heavier feel to the steering that sometimes i cannot manuever/turn the wheels (happen to once - i was not able to steer to the left/right until i turned off my ac...encountered it several times more. but once i'm on the road, everything feels ok with steering...i only experience that "stuck up feeling" the first time i try to steer to the left/right after taking off. could this be a power steering problem? is there such a thing as power steering pump not aiding enough with steering/loss of power to the pump?  i have also tried applying to spray type belt dressings but no help. |
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Post by beetOls on Mar 8, 2006 1:58:10 GMT 11
by the way, this is on a 4jb1t engine...
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Post by geeves on Mar 8, 2006 11:01:54 GMT 11
Strill say loose belts. The aduster attaches to the power steer pump and the belt tension does need to be quite high. If you can push the belt more than 1.5 cm in between the a/c and power steer with one finger they need tightening.
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Garth
Isuzu Senior
1989 Bighorn Irmsher R LWB
Posts: 164
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Post by Garth on Mar 8, 2006 11:22:30 GMT 11
Mine does it all the time when cold and I use the aircon. Sometimes also when turning at low speed and aircon on. Is belt tension problem that I sometimes get around to sorting out, but generally just don't turn on aircon until after a few minutes of driving and then she's sweet as.
Just one of those Isuzu things.
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Post by James W on Mar 8, 2006 11:33:58 GMT 11
Does it have 2 x belts on the power steering pump or one?
Even though clearly the power steer pump was loosing drive it could be on the crank shaft pulley as other things are also driven off the same belt, the sum of which are driven from the crank and can cause slipping. As it comes right a few minutes after starting the alternator is probably pushing the load over the edge as it's biggest load is often after starting to replenish the battery.
Mine doesn't have air-con so is configured slightly differnently and has only one belt to the power steer pump, but check yours and any other load on the same belt(s), i.e. alternator or air-con compressor.
Check tension as Geeves says but from experience once a belt starts slipping it wears and can be hard to stop slipping, try first of course but new ones work better.
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Garth
Isuzu Senior
1989 Bighorn Irmsher R LWB
Posts: 164
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Post by Garth on Mar 8, 2006 18:02:07 GMT 11
Mine has the 2 belts and it generally does slip on the crankshaft pulley but sometimes on the aircon one, depends on the day. Biggest reason I haven't tightened it again is coz the tensioner on the power steering pump housing has broken so now I have to use a big screwdriver and hammer to do it. Otherwise it is pretty easy to tighten yourself, just need a 14mm spanner or socket to loosen qty3 (I think) screws on the pump housing, and then turn the adjuster screw clockwise to increase tension. then tighten all the attach screws again and away you go.
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Post by beetOls on Mar 9, 2006 0:21:04 GMT 11
Boy am i glad to have someone with the same problem as mine. LOL! Garth -- i think you exactly know what i'm experiencing right now. And yes, i am more inclined to leaving it as it is since the slipping goes away after a while of driving anyway although the sound really irritates me. i am also using new belts already geeves -- i haven't really tried that finger method but i have consulted a number of mechanics and i think the tension is just enough. will see if i can push it with my finger and further adjust it if necessary. Funny thing is this is the first time i've encountered the problem after 10 years of using it! maybe it comes with aging, eh. hmm...somebody also said i could try rubbing a candle stick to the inner part of the belt! i can also give that a shot... that's definitely a poor man's solution to screeching problems. =) |
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Post by beetOls on Mar 9, 2006 0:23:39 GMT 11
@james w -- mine has 2 belts (for the aircon and steering pump); there's another one below for the alternator and waterpump
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Post by mulover on Mar 9, 2006 18:27:49 GMT 11
I would suggest geting a can of belt grab/grip and give that a go. Have alot of trouble with belt slip when i put my bigger alternator on and just used some of this stuff and have had no problems, air con on or off, when they start slipping again then i'll just spray some more on!!!
Remember of course that belts do stretch and they may be getting a gloss or glase on them.
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Post by James W on Mar 10, 2006 6:33:38 GMT 11
Honey and other sticky products can work as well on flat belts, Golden Syrup for example. It should also work for v belts. A handy hint for all those doing chaft cutting with a traction engine this harvest.
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Post by beetOls on Jun 21, 2006 16:44:19 GMT 11
just an update to this thread...
it was diagnosed that my PS pump is the culprit. it's currently leaking from the top right now, although i never had to add fluid to the reservoir. The high pitched sound comes from it as well. IS this something of immediate attention? I mean will it breakdown in a snap causing the vehicle to halt or i can just wait till the situation is aggravated?
Now, i do have 2 questions if i decide to have taken down.
1. Does it have a bearing or something that can be replaced and make it work again, plus replacing the seals/o-rings/repair kit? or in short, can the internals be repaired?
2. am i better off looking for surplus? Because brand new ones will set me back around US$500 (deymn!)
TIA
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Post by geeves on Jun 22, 2006 16:52:31 GMT 11
It shares the same internals as the Subaru Wagon so rebuild wont be to bad You cant use the Subaru pump though as it is different.
Dont leave it as sometims the shaft breaks sending the pulley through the engine. You can take the belts off but steering will be very very heavy and air con wont work
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Post by beetOls on Jun 23, 2006 22:02:10 GMT 11
thanks for the advice geeves, had the pump dismantled today and got a repair kit from one of our isuzu parts shops here at el cheapo price. now she's doing good again...but water pump pulley is starting to show bad signs as well...at least i know which course to take then after...
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Post by beetOls on Jun 27, 2006 15:14:03 GMT 11
as mentioned, i had the pump brought down the other day and replaced the internals using the kit i got...yes, the noise was noticeably trimmed down but...it's still there! Although the difference is i don't hear it that often...before, i hear the sqeaking sound everytime i go through snail pace pace traffic. now, i can only hear once cold and i turn the a/c and when steering wheel is in the extremes (or almost - left and right).
could it be my pulleys? do the surface wear out too which causes the belt to slip? i had it tightened already. could it be my steering gearbox too?
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Post by beetOls on Jul 2, 2006 3:16:09 GMT 11
ahh...finally kissed the problem away...the culprit...crankshaft pulley! took me awhile to have it isolated until i asked someone to turn the wheels left and right and actually saw for myself how it slipped...got an OEM one... everything's back to normal...
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Post by beetOls on Jul 2, 2006 3:21:35 GMT 11
one last thing...i was trying to review the posts and somebody did give the hint about the crankshaft pulley being the cause...i guess you're right james. thanks! and thanks to all those who replied as well... =)
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