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To adjust hot or cold?

Continuing on with a thread that disappeared somewhere...

OK, Teggers was pointing out that valve lash should be adjusted when cold. This has how I have undertaken it on several motorcycles as getting it to temp with the cams out, tank off etc to get at the shims is impossible (though insert advances in "special tools here).

The 4AC needs an inspection (one of those I've been putting off things) and am quite happy to adjust when cold. Will the earth and the moon require the interaction of McGyver to untangle the evil that may be unleashed if I do it this way?

If not, why is it that all the Australian Spec manuals have "get car to operating temp, t(h)en burn fingers adjusting valves?

Cheers

Hammo

Reply to
Hammo
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Like I mentioned before Hammo, the manual will dictate the procedure. Adjusting valves on sport bikes requires cam removal due to component size and the amount of room allowing shim adjustment. It's just too darn tight in there to do anything! Tank off, air box, hoses, etc,. I know on a bike it's not a fun job but that's how it has to be done, and the manufacturer plans for it. Fortunately, valve lash adjustments on most sport bikes are quite lengthy between intervals. A car allows much more room and the components are far larger. Do it the way the manuals say to IMHO.

Reply to
user

[snip duplicate]

Damn vanishing and then reappearing posts!

The Kwakka ZX1100A2 was one of my bikes that required all that stuffing about (early - mid 80's DOHC central tunnel cam chain with tappet cover as part of te tensioning body).

I agree with what you were say about the manual, though was interested when Teggers said he had never seen it written to adjust valves hot on the (mighty) 4AC.

I was going to measure the lash cold and compare when hot and then guestimate what to do for next time (this being a newish motor).

Thanksfor the replies. Oh, I had to swap the old carby for this motor as whatever was on there had two fuel sonoids and pollution/vac hoses that didn't line up with any of the pics yourself and other posters scanned/posted. Strange world..

Cheers

Hammo

Reply to
hammo

On the current 4 cyl Camry engine 2AZ-FE, Toyota manual say to adjust cold. As this engine uses shimless type lifters it would be difficult to keep the engine hot while removing the valve cover and making the sixteen measurements neccesary before making any lifter changes. Toyota knows how much the vave expands when hot so its not a big deal to supply a COLD spec.

Intake 0.19 - 0.29 mm (0.0075 - 0.0114 in.)

Exhaust 0.30 - 0.40 mm (0.0118 - 0.0157 in.)

I am more surprised by the 0.1 mm tolerance allowed.

Slim

Reply to
Slim Pickings

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