|
|
|
|
| Author |
|
|
Registered
Join Date: Mar 2010
Posts: 41
|
Nice whine from the front of the Engine and not the Turbo
No water leaks, no belt dust and not running remotely hot but feeling the few month old water pump is going. New Timing belt and pulleys.
The sound is worse when you start up and quietens down but is still there. Any pointers out there before I loose the engine or head. 
|
||
01-03-2011, 02:41 PM
|
|
|
Proprietoristicly Refined
Join Date: Jul 2001
Location: ~Carefree Highway~
Posts: 5,833
|
Here is a video----move to bottom of page-----"overtightened balance shaft belt" sound..
http://arnnworx.com/tensioningbelts.htm When you check your cam belt, try the "WaterPump Pully test" to see if the cam belt is overtightened. If the belt is too tight it will burn out the seal and the bearing  GL John
__________________
1988 924S, 85,750K ..+ 1987 924S, 154K DD (+15K est. bad odo) |
||
|
01-03-2011, 03:11 PM
|
|
|
Redline Racer
Join Date: Jan 2007
Posts: 2,444
|
It's probably the balance shaft belt, and it might actually be too loose given that it gets better when warmed up. That has usually been the case when my car has done that. A balance shaft belt that is too loose will whip alot more and rub on the smooth guide roller, making a whining noise that's more of a rubbing whine that sounds slightly inconsistent, whining more or less depending on the rpm, whipping kind of like harmonics in a string at certain frequencies. The too tight sound like in the video link whines very evenly and consistent across the rpm range like a supercharger sound. It could also be that the guide roller is adjusted too close to the belt. It should be just barely not touching the highest point of a tooth when the tooth is closest to it, max 0.5 mm.
It's a finnicky thing to get a feel for by hand, but luckily not very sensitive to inexact tensioning. I usually slap the AFM back on and start up after my belt job but before putting everything back together and run at various rpm up to about 3000 and watch and listen to the belt. to check my setting.
__________________
1987 silver 924S made it to 225k mi! Sent to the big garage in the sky Last edited by HondaDustR; 01-03-2011 at 09:37 PM.. |
||
|
01-03-2011, 09:31 PM
|
|
|
All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
Posts: 2,516
|
Quote:
Right now it is quiet when cold, but the zinging noise does start in after it is warmed up, when rpms go above about 2K. That means just a wee bit too tight, correct?
__________________
>gray 89 951S - K27/8, MAF, 3" intake, 3" exhaust w/separate waste pipe, 55# inj, late cam; >red 87 924S - chip, K&N, punched-out cat&muffler >black 80 924 - (sold) >maroon 77 924 - auto (sold) |
||
|
01-04-2011, 06:53 AM
|
|
|
Registered
Join Date: May 2003
Location: Stumptown
Posts: 502
|
Just a silly suggestion, but is your power steering fluid full? Friend of mine chased a strange belt noise for a bit to find it was the pump whining....
|
||
|
01-04-2011, 08:10 AM
|
|
|
Registered
Join Date: Mar 2010
Posts: 41
|
re
All that is good, but I will listen and see if the pump is the cause. With it all being right there together and the way sound travels.. Interesting.
|
||
|
01-04-2011, 10:55 AM
|
|
|
|
Redline Racer
Join Date: Jan 2007
Posts: 2,444
|
Quote:
__________________
1987 silver 924S made it to 225k mi! Sent to the big garage in the sky |
||
|
01-05-2011, 11:41 AM
|
|
