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Registered User
Join Date: Oct 2010
Posts: 11
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944 Balance Belt Tensioner Tool
Hey there guys,
I am currently trying to do the cambelt on my 944 2.5 1987(8 valve model). From advice which I have been given on this forum, I will try and do it myself but I understand that the balance belt installation is critical to this job. I was wondering if anyone knows where I can get a Porsche balance belt tensioner tool for a reasonable price? thanks Will |
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12-17-2010, 03:42 AM
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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
Posts: 2,516
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I think you are confusing the BS belt with the timing belt. THE TIMING BELT IS THE CRITICAL ONE! But on an 87, there should be a spring-tensioner for it. There IS a certain procedure that you should follow for setting it though. But no special tools are required. If the timing belt breaks or comes off while the engine is running, major damage can be assured. But that isn't the case with the BS belt. It will vibrate like crazy though, due to being out of balance.
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>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) |
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12-17-2010, 04:02 AM
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Proprietoristicly Refined
Join Date: Jul 2001
Location: ~Carefree Highway~
Posts: 5,833
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Will,
The following information is specific to the balance belt-----NOT the cam belt. I use the Krikut tool when I do my balance belt. It is available direct from the manufacturer for about $15. The other similiar style belt guage is the OptiBelt guage. NAPA may have the Krikut--KR1 Belts I do not recommend the Krikut or Optibelt guage for the cam belt The normal problem in setting the BB (balance belt) is that you will have it too tight and it will "whine". Move down to the bottom on this link for a short video on how a BB sounds when too tight. http://www.arnnworx.com/tensioningbelts.htm Cam Belt info. You need experience and the correct tools to adjust the cam belt. The spring tensioner does not do it for you. It get close. Get the Porsche tool or at least the Arnnworx P920X tool. Home Practice and do it over a couple of times. Then check your work with this last "WP pully test" to see if you are close.  Spring tensioner TIPS. Set the engine to TDC at the cam gear and FW--TDC hole. Do not turn the crank if the spring tensioner A & B nuts are loose. Wake Up the Spring tensioner roller spring by rocking the roller L & R. Cars with the spring tensioner are adjusted at TDC! (Not minus 5-10 degrees CCW) Not responsible for massive engine failure due to improper tension or bent valves. GL John
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1988 924S, 85,750K ..+ 1987 924S, 154K DD (+15K est. bad odo) |
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12-17-2010, 05:21 AM
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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
Posts: 2,516
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I think that the 5-10 degrees back-turn of the cam gear is suggested strictly for making sure that the tensioner is taking up all of the slack on the other side of the cam/crank pulleys. If the belt teeth are properly engaged in the gears, it will not go out of time.
Interestingly, that method of checking the cam belt tension that was just presented, is VERY close to the method that I use for checking the accessory belt tension.
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>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) |
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12-17-2010, 06:03 AM
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Proprietoristicly Refined
Join Date: Jul 2001
Location: ~Carefree Highway~
Posts: 5,833
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Early cars without the mechanical "Spring belt tensioner" are required to turn the crank CCW 10 degrees or 1 1/2 cam gear teeth (CCW) to set the cam belt tension. If you have the "spring belt tensioner", the belt is set at TDC.
 John
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1988 924S, 85,750K ..+ 1987 924S, 154K DD (+15K est. bad odo) |
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12-17-2010, 06:39 AM
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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
Posts: 2,516
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OK, but I still think that you should put either some forward pressure on the crank, or some back pressure on the cam (without actually moving them, if that is the case, for the spring type tensioner), to make sure all of the opposite-side slack is removed.
__________________
>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) |
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12-17-2010, 09:39 AM
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Registered User
Join Date: Oct 2010
Posts: 11
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Thank you kindly for all your advice
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12-17-2010, 10:30 AM
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