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360 Knock at Idle |
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mstrcrftr
Supporter of TheAMCForum Joined: Jul/12/2010 Location: houston Status: Offline Points: 2066 |
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Wow, i havent heard any speak of that method in years. Very old school and very very effective. ^5 Hurst390. |
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Boris Badanov
AMC Addicted Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209 |
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Dry fuel pump will eventually self destruct.
Has it got headers? They can leak at one port (and often do) resulting in a rod knock like noise. |
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Gremlin Dreams
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mixed up
AMC Addicted Joined: Jun/16/2015 Location: Monroe mich Status: Offline Points: 2177 |
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use a dowl rod or broom handle or some thing that will transfer sound hold it to he ear and to different parts of motor will help find the knock lose torq convertor bolts will knock
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69 amx 290 auto
65 220 290 4spd 80 ford fairmont |
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Brynjaminjones
AMC Apprentice Joined: Sep/27/2017 Location: Derbyshire, UK Status: Offline Points: 55 |
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Cool, thanks guys. I need to find out how the LPG/gas system works and where exactly it cuts off the fuel, as I'm wondering if the pump could be running dry.
It doesn't have headers - just the original cast style manifold. Whilst inspecting last night I noticed that the air pump has been removed, and as such it looks like any other ports on the exhaust have been plugged (although I'm not quite sure what the original setup would've been). In case it was missed in my previous post, I've also got a video of some play in the water pump shaft. This is with the belts slackened off: Do you think this could cause a knock that would only be audible when warm? I'm wondering if it could get worse once the viscous fan is locking-up, putting more force on the shaft?
Edited by Brynjaminjones - Sep/29/2017 at 6:19am |
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Boris Badanov
AMC Addicted Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209 |
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No video, but there should be NO observable axial play.
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Gremlin Dreams
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Brynjaminjones
AMC Apprentice Joined: Sep/27/2017 Location: Derbyshire, UK Status: Offline Points: 55 |
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Video should be sorted now - my bad!
There definitely seems to be some play.
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amcfool1
AMC Addicted Joined: Jun/18/2011 Location: roanoke va Status: Offline Points: 1075 |
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if your water pump shaft has play in it, its bad, thats your knock. happened to my a couple of years ago. Replace water pump, no more knock. good luck, gz
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george z
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Boris Badanov
AMC Addicted Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209 |
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Yep, the water pump is totally screwed.
Agreed, that's your knock. |
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Gremlin Dreams
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Brynjaminjones
AMC Apprentice Joined: Sep/27/2017 Location: Derbyshire, UK Status: Offline Points: 55 |
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Thanks for the help guys. The cooling system needs a good flush anyway, but unfortunately I don't have the means to do so at home, so it's booked in for a replacement next week.
I'll report back to confirm whether that was the problem!
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Brynjaminjones
AMC Apprentice Joined: Sep/27/2017 Location: Derbyshire, UK Status: Offline Points: 55 |
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Hi Guys,
After an eventful week in the shop (many snapped bolts), the water pump has successfully been changed. This has got rid of the severe play in the shaft, although the viscous fan clutch has a little play too. At first it seemed like the knock was gone, but a couple of days later I noticed that it's back. The Jeep drives beautifully (mechanic said the same - I forgot to ask him to listen for the knock but he evidently didn't notice it) and I've put a few hundred miles on it with no change in sound. The knock still isn't really audible when the engine is cold (this could be because of all the other noise), or at anything much above idle. I've not got a video of my Jeep, but the one in this video sounds the same to me in both sound and speed: |
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