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Joined: Dec 2001
Posts: 217
Backyard Mechanic
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OP
Backyard Mechanic
Joined: Dec 2001
Posts: 217 |
Howdy,
Any suggestions on what would cause a ticking noise from the front of a 28 engine? Sound seems to originate from either the timing gears or below. Sound is loudest when the stethoscope is placed on the front of the pan. It doesn't sound like a knock but rather a tick. All I can think of is debris stuck to the crank gear, or cam inplay. I checked the #1 rod bearing and clearance is fine. The tick is more noticable when engine is warm. I cannot hear it from inside the car so I can't tell if it's better or worse under load. Hard to tell but I think shorting #1 plug seems to help.
Thanks,
Ron
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Joined: Nov 2001
Posts: 19,758 Likes: 64
ChatMaster - 15,000
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ChatMaster - 15,000
Joined: Nov 2001
Posts: 19,758 Likes: 64 |
Did you check the crankshaft pulley? It will make a ticking noise if it is loose on the crank.
How Sweet the roar of a Chevy four!
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Joined: Aug 2002
Posts: 123
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Aug 2002
Posts: 123 |
Rusty,
How about removing the fan belt and run it briefly to eliminate the fan/water pump/generator? Dan
OIL CAN DAN
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Joined: May 2005
Posts: 563
Oil Can Mechanic
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Oil Can Mechanic
Joined: May 2005
Posts: 563 |
Front cover could just be acting as a sound box.
Number one plug could be the clue..... Is it an electric spark jumping a gap causing the tick ?
(.)(.) ( Y ) (.)(.) ( Y ) (.)(.) ( Y ) ( Y ) ( Y )
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Joined: Dec 2001
Posts: 217
Backyard Mechanic
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OP
Backyard Mechanic
Joined: Dec 2001
Posts: 217 |
I think I found it. The pin in the distributor drive gear was loose.
Thanks,
Ron
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Joined: May 2005
Posts: 563
Oil Can Mechanic
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Oil Can Mechanic
Joined: May 2005
Posts: 563 |
Hope that's it Ron, well done. 
(.)(.) ( Y ) (.)(.) ( Y ) (.)(.) ( Y ) ( Y ) ( Y )
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Joined: Nov 2001
Posts: 19,758 Likes: 64
ChatMaster - 15,000
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ChatMaster - 15,000
Joined: Nov 2001
Posts: 19,758 Likes: 64 |
An automotive stethoscope is a very valuable diagnostic tool. If you dont have one a very long screwdriver, piece of dowel rod, metal rod or other similar item can be used. Carefully place it next to your good ear and place the other end near the suspected source of the noise. Be very careful not to get it too close to any rotating parts. It will take a while to separate the normal whirrs, taps, etc. from the problem noises but with a little practice you will be able to tell a good bearing from a bad one. It is essential to move the probing end around the area of the suspecious noise to know where it is coming from and verify that it is not normal.
How Sweet the roar of a Chevy four!
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