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Location: Central CA
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Is it normal for new timing belts to whir?
I just replaced the timing belts on my daughters 944. There is a noticable whir sound. Do I need to loosen them, or should it quiet as the belts break in?
I set the tension using the tension gage from 44andmoreparts.com. Thanks, Mike
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'69 911 Targa w/ 3.2 |
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08-24-2005, 11:05 AM
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usually means that its too tight. honestly, i dont know a whole lot about this, but i read a forum that states that if a whirring noise is present, the belts are too tight.
good luck |
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08-24-2005, 11:21 AM
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Location: Edmonton, Alberta, Canada
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Mine whirrrrr when new.
Just drive it like you normally do ........ then retension at specified interval.
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Alex - PCA Polar Region - Boxster Muncher 86' 944 Turbo - Megasquirt - 326 rwhp/340lbft @ 18 psi SOLD www.edmontonhomelife.com www.edmontonrealestate.ws |
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08-24-2005, 11:45 AM
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It is hard to tell from the pictures but I think you got the Krikit tension gauge that is made by Gates Rubber. Some people swear by it, however I used it against the P9201 tension tool and got some differences in measured tension. I've got enough friends that will loan me the 9201 tool (costs something on the order of $450) so I just use that. However, if you figured out how to use the Krikit right you are probably pretty close to being right.
The whining is probably due to balance shaft belt being too tight, that is the one that really likes to complain. Could also be the cam belt. It should calm down after it gets broken in, probably 1000 miles. Official Porche mechanics say this whine is normal, though, I think it is a bit too tight. If the noise isn't too bad I'd let it go and retension at 1200 miles. Edit: I forgot to mention the most interestin thing about the Gates Kirkit tool. They have a warning not to use it to tension timing (cam shaft) belts. I know this may be a legal move, but if Gates Rubber, one of the biggest belt manufacturers in the world, says don't trust this cheap tool we sell, you got to think twice about what you are doing. Bent valves is not a happy time. 
Last edited by IceShark; 08-24-2005 at 11:58 AM.. |
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08-24-2005, 11:48 AM
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Thanks for the input.
Yes it is the Gates tool. (I couldn't see spending $450 for a tool, when the whole car only cost $1,000.)
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'69 911 Targa w/ 3.2 |
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08-24-2005, 12:07 PM
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Disposable Porshes. What does dependable day to day transportation really cost.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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08-24-2005, 12:19 PM
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disgusted
Join Date: Jul 2005
Location: the rubber city O-hi-O
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Whirring may indicate too tight, but whining definitely does. Too tight belts can equal worn out bearings and seals.
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Michael Manning 95 Independent Fabrication Deluxe You are not what you own! |
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08-24-2005, 01:17 PM
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It could also be the balance belt idler is touching the belt. That can make a hell of a whirr, almost like a super charger sound. IIRC, it should be .5 mm from the teeth on the belt.
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Still looking for the right deal on another P-car 1968 BMW 1600 2 liter 1956 Ford F250 1955 BMW R69 1999 Range Rover Callaway #011 of 220 (Yeah, as in Callaway Corvette...) |
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08-24-2005, 03:38 PM
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Bent valves is not a happy time[B]Bent valves is not a happy time
Your not kidding! my valves are bent right now |
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08-24-2005, 06:17 PM
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still trying to figure out how to get the stupid cylinder head off to be machined!!
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08-24-2005, 06:18 PM
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Figuring that out is a right of passage.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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08-24-2005, 09:32 PM
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My belt whined after I replaced it - I checked both belts with the Porsche tensioning tool 2x, all within specs, still whine, like a small supercharger.
I quitened down after a 1000 or so km's and now after 5000 km's its totally quite. I read in previous discussions that aftermarket belts are prone to do this - mine are aftermarket belts.
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1983 944 RHD Original. Uses all my spare cash! 1947 Morris Sold 1972 Benz Sold 1975 Benz Sold 1976 Benz Sold 1977 Benz Sold |
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08-24-2005, 09:44 PM
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LOL. your absolutely right! Alan bolt got stuck between head and block
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08-25-2005, 08:26 AM
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Mine? Have whine, will travel. Retensioned at specified intervals. Used krikit. I tihnk this'll work fine as long as the belt gets changed every couple of summers so I don't get into aged belt territory.
Your whir should subside after a while unless something's really too tight. Check again at about 5000miles and have a look at all the rollers and tensioners - they may have a story for you.
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'88 944 Auto - project, kinda '87 944 Auto - died saving my wife '84 944 5SP - crushed under shop roof during snow storm All others GONE! |
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08-25-2005, 09:19 AM
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Hey, SoCal,
I pulled a 944 head this summer. Is this why I'm a Senior Member now? Someone told me it had more to do with socks...
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'88 944 Auto - project, kinda '87 944 Auto - died saving my wife '84 944 5SP - crushed under shop roof during snow storm All others GONE! |
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08-25-2005, 09:20 AM
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lol. well...if any one has any suggestions, im all ears. i was thinking of just drilling the bolt out
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Do not use Not because not using Not makes things not as complicated as using Not. 1987 Porsche 924S (Rest in pieces) 1988 Porsche 924S (Current daily driver) 2002 Mazda Protege (Gave to girlfriend as piece offering during one of her cycles 
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08-25-2005, 11:44 AM
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Hey, djkoke18 - try removing the cam gear and the camshaft. May give you some room..or at least the ability to see some more...depending on which bolt is stripped.
Haven't we hijacked this thread? Sorry, folks.
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'88 944 Auto - project, kinda '87 944 Auto - died saving my wife '84 944 5SP - crushed under shop roof during snow storm All others GONE! |
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08-25-2005, 02:13 PM
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i did. everything is out. cam, airbox intake,....everything. its just this stupid bolt thats stuck between the head and block...i dont know how to get it out
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Do not use Not because not using Not makes things not as complicated as using Not. 1987 Porsche 924S (Rest in pieces) 1988 Porsche 924S (Current daily driver) 2002 Mazda Protege (Gave to girlfriend as piece offering during one of her cycles
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08-26-2005, 10:15 AM
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Can you chisel the head off?
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'88 944 Auto - project, kinda '87 944 Auto - died saving my wife '84 944 5SP - crushed under shop roof during snow storm All others GONE! |
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08-26-2005, 02:39 PM
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i cut the head of the alan bolt off thinking that the cylinder head should slide right off.....nope! the bolt is bent holding the head and block together
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Do not use Not because not using Not makes things not as complicated as using Not. 1987 Porsche 924S (Rest in pieces) 1988 Porsche 924S (Current daily driver) 2002 Mazda Protege (Gave to girlfriend as piece offering during one of her cycles
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08-26-2005, 07:08 PM
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1983 Porsche 944 2.5 liter
