Engine knock?

[Jay-Impala-man]

My 98' Esteem has a loud knocking when it is cold outside and goes away after the motor gets warm. What could it be? I have over 103,000 miles on it. I keep everything changed on it. Please help. Jay-Impala-man kkjc805@netscape.com

[Isuzuzuki]

Sounds like a lifter is sticking.

[maverick214]

Originally Posted by Jay-Impala-man

My 98' Esteem has a loud knocking when it is cold outside and goes away after the motor gets warm. What could it be? I have over 103,000 miles on it. I keep everything changed on it. Please help. Jay-Impala-man kkjc805@netscape.com

Did you find out what this is?

My 2001 with 124k miles has a loud knock that goes away after warm.
Also, looks like you have to adjust the valves on the 1.6l engine, anyone know how to do this?

Thanks!

[Isuzuzuki man]

A solid lifter, one that is adjustable is not the type that generally can stick and make loud noises. A hydraulic lifter can do that, especially in cold temps when the oil is thick.

Adjusting the solids is easy; start with any cylinder, number one is good, rotate the engine until all the valves are closed (the cam follower is on the base circle and not the lobe), this occurs at TDC of the power stroke, using a feeler gauge of the specified thickness (see manual) check the gap, it should be a slight drag, if not adjust it. It doesn't have to be perfect, the manual specifies the range, plus or minus .001" should be fine. Rotate each cylinder to TDC of the power stroke and repeat. Note the EX and In valves have different gaps.

[joseph2008]

Engine Knocking in spark-ignition internal combustion engines occurs when combustion of the air/fuel mixture in the cylinder starts off correctly in response to ignition by the spark plug, but one or more pockets of air/fuel mixture explode outside the envelope of the normal combustion front. The fuel-air charge is meant to be ignited by the spark plug only, and at a precise time in the piston's stroke cycle.
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[Isuzuzuki man]

But knocking is something that happens under hot load conditions. This sounds more like something in the engine that is loose, as the engine warms up the parts expand and take up the space, thus any looseness may become inaudible.

[muthu]

Knocking in an engine is not good and it may need to be rebuilt by a professional so I would not ride any more until a motorcycle mechanic looks it over. If your bike is a 2 stroke engine the engine will need to be rebuilt every 50 or so hrs but depending on hard it is ridden, etc.
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Muthu

...::: Sreevysh Corp :::...

[RebelPC`]

Like any engine with 100,000+ miles things get a bit worn.......try an additive.....I swear by Lucas Oil Stabilizer........it will keep a nice coating on the worn parts and help when the engine starts cold.....should help quiet it down consideralbly..........