2.87 pulley cracked. WTF?
10-03-2011 | 11:31 AM
#1
Thread Starter
Registered User
iTrader: (11)
Joined: Jan 2007
Posts: 1,912
Likes: 1
From: Pembroke Pines
2.87 pulley cracked. WTF?
After shredding my belt I noticed a crack on the 2.87 pulley. What in the world could have caused this? I'm assuming this was the reason for shredding my belt.
10-03-2011 | 01:10 PM
#3
When you pull it off, see if it was rubbing the Jackshaft housing on the inside of the pulley.
Very little clearance there. Some rub, some don't. I just chamfered the front edge of the Jaskshaft Housing about .060" for more clearance, instead of machining the pulley and making it weaker.
Very little clearance there. Some rub, some don't. I just chamfered the front edge of the Jaskshaft Housing about .060" for more clearance, instead of machining the pulley and making it weaker.
10-03-2011 | 02:16 PM
#4
Thread Starter
Registered User
iTrader: (11)
Joined: Jan 2007
Posts: 1,912
Likes: 1
From: Pembroke Pines
There is plenty of clearance all around. I just can't figure out what could have crack it along the inside like that. The only thing I can come up with is that I have no under tray , and maybe some debris got in there and hit it right. On a side note, I had been getting belt squeal for the past 3-4 months, but I couldn't tighten the belt any further. I threw on a Goodyear belt to get the car home, and the belt squeal was gone. I had to remove gtm pulley to get the belt on cause the only belt they had was 5mm smaller.
10-04-2011 | 07:17 AM
#5
debris would never bounce 90* straight up like that and miss all the other stuff in the way. It would have to go around the bottom charge tube which would be near impossible.
I would say manufacturing defect OR maybe it was dropped at some point on that lip causing it to be weak. After all the heat cycles (that thing gets stupid hot) it finally weakened that crack enough to fling the piece off.
Also, what Tim is talking about clearance is BEHIND the pulley. You won't see if it's rubbing unless you remove the pulley. So you removed the pulley and there is no rubbing on the backside inside the recessed area? That would cause excessive heat which could cause metal failure.
I would say manufacturing defect OR maybe it was dropped at some point on that lip causing it to be weak. After all the heat cycles (that thing gets stupid hot) it finally weakened that crack enough to fling the piece off.
Also, what Tim is talking about clearance is BEHIND the pulley. You won't see if it's rubbing unless you remove the pulley. So you removed the pulley and there is no rubbing on the backside inside the recessed area? That would cause excessive heat which could cause metal failure.
10-04-2011 | 08:07 AM
#6
Thread Starter
Registered User
iTrader: (11)
Joined: Jan 2007
Posts: 1,912
Likes: 1
From: Pembroke Pines
The pulley was purchased used and I remember noticing that it had been machined down along the inside as mentioned. Looks like you guys called it on this. Thanks for pointing that out.
debris would never bounce 90* straight up like that and miss all the other stuff in the way. It would have to go around the bottom charge tube which would be near impossible.
I would say manufacturing defect OR maybe it was dropped at some point on that lip causing it to be weak. After all the heat cycles (that thing gets stupid hot) it finally weakened that crack enough to fling the piece off.
Also, what Tim is talking about clearance is BEHIND the pulley. You won't see if it's rubbing unless you remove the pulley. So you removed the pulley and there is no rubbing on the backside inside the recessed area? That would cause excessive heat which could cause metal failure.
I would say manufacturing defect OR maybe it was dropped at some point on that lip causing it to be weak. After all the heat cycles (that thing gets stupid hot) it finally weakened that crack enough to fling the piece off.
Also, what Tim is talking about clearance is BEHIND the pulley. You won't see if it's rubbing unless you remove the pulley. So you removed the pulley and there is no rubbing on the backside inside the recessed area? That would cause excessive heat which could cause metal failure.
Thread
Thread Starter
Forum
Replies
Last Post
EnjukuRacing
Engine
0
09-11-2015 08:30 AM
