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Tool Talk Discussion Forum

piston slap????

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mike-ga

03-12-2007 04:43:08




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I ahve an old 77 toyota pu that has who knows how many true miles. It is a good old truck in good shape and runs good. It is used as a farm vehicle mostly but I have a question. After the little engine warms up, it has a slight knock in the engine. it goes away at different engine speeds but is worse a little above idle. Sounds like what I have known as piston slap, but doesn't piston slap just go away after engine is warm and piston expands. I just keep the oil changed and keep it idled above the knock area. Just wondering. I have tried different oils over the past couple of years, but have not adjusted the valves or anything.

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justplainjim

03-15-2007 16:28:54




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 Re: piston slap???? in reply to mike-ga, 03-12-2007 04:43:08  
timing chain, timing chain, timing chain!

you will need new chains, sprockets, tensioners.

do it now!



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Rod in Smiths Falls, ON

03-14-2007 14:52:22




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 Re: piston slap???? in reply to mike-ga, 03-12-2007 04:43:08  
Are you sure it isn't just your tappets rattling as they warm up? Those engines have adjustable valve clearances, but the tappets rattle quite a bit in the first few minutes of operation even when they are set correctly.

That said, it's not hard to adjust the valves, and if you are careful you can likely get away without replacing the gasket set on a farm vehicle.

A worn timing chain produces a distinct "vrooming" sound at gear changes, quite different from what you described.

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TomTX

03-12-2007 12:26:30




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 Re: piston slap???? in reply to mike-ga, 03-12-2007 04:43:08  
As Old said, my neighbor's old Toyota PU has the plastic tensioners worn out, letting the chain rattle. Better change them. Tom



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old

03-12-2007 07:18:35




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 Re: piston slap???? in reply to mike-ga, 03-12-2007 04:43:08  
I'd also say timing chain and if it is if you don't change it fast it will eat a hole in the timing cover and thats a bigger problem in its self because it can then take out the water pump etc. BTDT and found out the hard way



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cj3b_jeep

03-12-2007 07:00:56




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 Re: piston slap???? in reply to mike-ga, 03-12-2007 04:43:08  
Could be a wrist pin also, but most likely the timing chain, when need to be done every 110,000 miles on the 22r



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MSM

03-12-2007 06:23:05




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 Re: piston slap???? in reply to mike-ga, 03-12-2007 04:43:08  
Might be a loose timing chain or worn tensioners. The timing chain rattling against timing cover gives the same noise.



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NEsota

03-12-2007 06:12:30




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 Re: piston slap???? in reply to mike-ga, 03-12-2007 04:43:08  
Always thought that piston slap was the skirt of the piston slapping the cylinder wall, this being due primarily to ring, ring-groove and cylinder wall wear. Is this right or wrong?



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Buzzman72

03-12-2007 05:04:02




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 Re: piston slap???? in reply to mike-ga, 03-12-2007 04:43:08  
Piston slap, as I've always understood the term, comes from wear on the piston skirt below the pin. Whether or not it goes away when the engine warms up, then, would be a function of just how much wear there is on the skirt(s).



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