needing a new MT clutch procedure

piston slap under load is definitely something to keep an eye + ear on the lookout for
would it sound like pinging noise?

how does something like that get tested evaluated
needs an adjustment ??
 
Piston slap sounds more like large ball bearing's clattering in the motor, a sure sign of a tired motor. Pinging happens in engines with big miles from too much carbon accumulating on the pistons increasing the engines compression ratio....it becomes more noticeable when running lower octane fuels when under load.
 
1-June-2o24

newish throwout bearing is still making a chatter for a couple thousand miles or so far is has NOT gone away :confused:
 
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You've been quiet as of late, figured you've been packing some miles on with your new gen4 taco.
 
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If your pistons are worn enough to "slap" in the cylinders, then you have an engine that is scrap.

Piston to cylinder clearance is in the range of 0.0001 inches, maybe a bit more but 0.001 is a large clearance at this location. I seriously doubt if you can hear piston "slap" over the noise of a running engine.
 
My 4.7 tundra was noted for piston slap till the engine reached a certain temp. You thought you had ball bearings rattling in a tin can it was so loud. Was that way from day 1 till over 290k miles when I sold it....even asked toyota about it, and heard other 4.7 v8's of theirs that were the same. Toyota claimed it was due to the use of forged pistons vs cast. Engine never touched a drop of oil, and ran strong.
 
Those Toyo mechanics were feeding you a load of bull squeezins.

Forged or cast, the pistons would be made to the same clearances.
 
Rock62 said:
Those Toyo mechanics were feeding you a load of bull squeezins.

Forged or cast, the pistons would be made to the same clearances.
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That's not entirely correct. I've built countless 2 stroke stock, and race engines using cast, and forged pistons. Forged pistons always had more cylinder bore to piston squirt clearance when cold. They grow as they warmup. You could hone a cylinder for a cast piston with .004'' clearance, and be fine from the get-go requiring little to no warmup before hitting the throttle. Do the same with a forged piston, and you'll stick it. Forged are much stronger, but need another .0005''- .001'' to be safe. Forged will sound like crap during warmup, but quiet down once they grow to operating temps. Toyota is correct when using 2 dissimilar metals like that in their engines....aka, iron bore cylinders with forged aluminum pistons. They grow at different rates.
 
I can agree to a point.

Assuming the forged and cast pistons are both ferrous (iron) based, then the coefficient of expansion for the two are the same.

Ferrous based liner with Al piston is a more complex situation for thermal expansion.
 
Well I can't recall at anytime working with any iron based pistons, so thats kind of a moot point. I have had experience with various composition of alloys that makeup aluminum pistons depending their application.
 
You still running around with that clapped out clutch pedal linkage assembly, or is this just another bs video you've dug up?
 
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