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Old 11-19-2005, 01:06 PM   #1
rsk135
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Member#: 65578
Join Date: Jul 2004
Location: Pittsburgh
Default Tensioner Pulley NO threads!?

I was changing the timing belt and doing other routine maintenace on my 2000 Forester. I have done this three times in the last year on different subies and wasn't expecting any hang-ups BUT...I took of the tensioner pulley on the leftside of the main crank sprocket to get the belt on, when I went to replace that pulley the bolt didn't feel like it was threading. It just kinda spun. I thought perhaps it was miss threaded but when it came out I could not see the thread on the bolt as the threads from the block had come out!

The threads came off the bolt almost like a nut, looked more like a spring.
So what should i do? There were some threads left at the tip. Should I red loctite the heck out of it or attemp to re-tap the hole? Is there room for a longer bolt to get more bite?

Any help is appreciated. So much for "routine" maintenance.
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Old 11-19-2005, 01:14 PM   #2
Absubtle
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Join Date: Apr 2005
Location: ? is it Denver
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May get an inspection mirror and see how deep the hole is... see if there is any threads farther back... and get a longer bolt.
Or get a heli-coil thread repair kit.
Good luck

Absubtle
PA
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Old 11-19-2005, 03:07 PM   #3
rsk135
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yeah all my mirrors are unfortunately destroryed (hmm perhaps thats the reason for the bad luck here)

Also Doesn't helicoil require you to drill out the hole, I don't think even If I took the radiator out I'd have enough clearance.

I was trying to figure out what the torque spec is on that bolt and its the only bolt not labled in my subaru service manual.
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Old 11-20-2005, 03:45 PM   #4
Absubtle
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Yes the Heli-coil requires minor drilling... but a 90degree drill would work awesome. You can rent them from your local parts stores.. just have to leave a deposit. You may have to sacrifice a drill bit.. due to the length of most drill bits... I have a couple drill bits for heli-coil repairs sitting in my box.

Would be easier to see how deep the hole is and get a longer bolt w/ some red loctite.

Right-off-hand, cant remember... its a 12mm(head) bolt correct?

Absubtle
PA
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Old 11-20-2005, 09:56 PM   #5
ImprezaVA
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Location: Elkton, VA
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1998 Impreza L-SOLD
Arcadia Green

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I was threading those same two bolts on a guy's used '97 Impreza L when I felt the same thing. I was ratcheting and it wasn't getting tighter. I got that sick feeling and brought the bolt back out. When it came out, someone's heli-coil came with it.

If IIRC, you can buy a heli-coil kit between $20 and $30 from an autoparts store. However, we tapped it with a slightly bigger bolt and all has been well. Good luck.

-Charles-
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Old 11-20-2005, 10:21 PM   #6
ImprezaVA
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Location: Elkton, VA
Vehicle:
1998 Impreza L-SOLD
Arcadia Green

Post Torque Specs

Quote:
I was trying to figure out what the torque spec is on that bolt and its the only bolt not labled in my subaru service manual.
Automatic belt tension adjuster: 18.4 ft-lb
Timing belt Idlers: 28.9 ft-lb
Timing belt guides (MT): 7.2 ft-lb
Camshaft sprocket bolt: 57.9 ft-lb
Crank pulley bolt: 130.2 ft-lb
Timing Belt cover bolts: 3.6 ft-lb

-Charles-
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Old 11-21-2005, 09:15 AM   #7
rsk135
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Thanks for all the replies. I did purchase a helicoil hit. The bolt is M10 1.25x1 and well in my backwoods area for PA there wasn't anyplace to get a M10 helicoil kit so I went with 3/8 which is just a bit smaller bolt wise but the helicoil insert tapped in just perfect.

There wasn't any way to use a longer bolt all the threads were gone, so it was helicoil and red loctite for good measure.

I should take a picture of the threads I pulled of the bolt I've never seen anything like this. The threads came out of the block clean. Which makes me wonder if it was do to a weakness when the block was cast? And if so I wonder what other areas might be weakened?
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