 Help!!!, Mercedes MBE900 |
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 Aug 8 2017, 05:28 PM
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#1
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Advanced Member  Group: Advanced Members Posts: 412 Joined: 26-August 09 From: Mathews Va Member No.: 6,032  |
https://flic.kr/p/WVFGfS
Any help is appreciated. This is the 6th time I'm doing this job. The bolts for the fan belt tensioner mount keep breaking. I'm out of ideas. I have replaced everything. I've tried different grade bolts and even studs. I think the problem is with the metal surface you can see breaking away at the 2 bolt holes. If that's the case it will require a new engine as it is part of the block and not a cover. Any ideas or advice? The fan hub turns freely and is working properly. That's all this belt runs. |
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Aug 10 2017, 11:24 AM
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#2
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FRRAX Owner/Admin Group: Admin Posts: 15,437 Joined: 13-February 04 From: Ohio Member No.: 196 |
The bolts appear to be cracking from fatigue. To my eye, they look to be starting to crack on the "bottom" and the last bit of failure is the top section of each bolt (at about 10:30). Replace them with something from ARP? Are the bolts shanked bolts? Or fully threaded? If they are shanked, are they breaking at the last thread or are there threads left on the section that's not stuck in the block? Are they staying tight? If they were to start to come loose, then the belt flopping/vibrating the mount could start to fatigue crack the bolts.
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Aug 10 2017, 02:57 PM
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#3
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Advanced Member Group: Advanced Members Posts: 412 Joined: 26-August 09 From: Mathews Va Member No.: 6,032 |
QUOTE (trackbird @ Aug 10 2017, 07:24 AM)  The bolts appear to be cracking from fatigue. To my eye, they look to be starting to crack on the "bottom" and the last bit of failure is the top section of each bolt (at about 10:30). Replace them with something from ARP? Are the bolts shanked bolts? Or fully threaded? If they are shanked, are they breaking at the last thread or are there threads left on the section that's not stuck in the block? Are they staying tight? If they were to start to come loose, then the belt flopping/vibrating the mount could start to fatigue crack the bolts. This is the 3rd time in 2 months I have done this job on this truck. They are staying tight. the factory bolts are not shanked. |
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Posts in this topic
rocky Help!!! Aug 8 2017, 05:28 PM
nape Is it a clutch fan? Fan clutch not disengaging at ... Aug 9 2017, 09:16 PM
00SSHarrison QUOTE (nape @ Aug 9 2017, 09:16 PM) Is it... Aug 10 2017, 04:59 AM 00SSHarrison I tried to find some info on this but there is no ... Aug 10 2017, 05:10 AM rocky QUOTE (00SSHarrison @ Aug 10 2017, 01:10 ... Aug 10 2017, 02:55 PM CrashTestDummy Is the block aluminum? If so, you should be able ... Aug 10 2017, 12:47 PM mikedamageinc Are electric fans an option? Aug 10 2017, 02:41 PM rocky The block is not aluminum. Funny I said something ... Aug 10 2017, 03:01 PM PeteL QUOTE (rocky @ Aug 10 2017, 11:01 AM) The... Aug 10 2017, 04:15 PM rocky QUOTE (PeteL @ Aug 10 2017, 12:15 PM) QUO... Aug 10 2017, 05:04 PM trackbird It's a little "hillbilly", but I won... Aug 10 2017, 05:11 PM rocky Hmm I did not think of that either. It is back tog... Aug 10 2017, 05:40 PM 00SSHarrison Do you know if the idle speed has been lowered? we... Aug 11 2017, 05:27 AM rocky It is idling at the same speed as the other ones I... Aug 11 2017, 12:32 PM CrashTestDummy And you've gone ahead and replaced the idler a... Aug 11 2017, 02:06 PM rocky QUOTE (CrashTestDummy @ Aug 11 2017, 10:0... Aug 21 2017, 03:39 PM CrashTestDummy QUOTE (rocky @ Aug 21 2017, 10:39 AM) QUO... Aug 22 2017, 01:52 AM Ojustracing One last thing. Does this truck idle with no surg... Aug 22 2017, 01:08 PM rocky Yes from what I can see it runs just as smooth as ... Aug 22 2017, 03:10 PM |
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