jimr

Anybody get an off beat noise from motor when first fired up from cold?

CLICK........CLICKCLICKCLICK....CLICKCLICK..CLICK. ..CLICK

Only for about 45-60 seconds....then it subsides.

Doesn't have the "clack" or "tap" of a mechanical noise.

????



thanks
Jim

Uncle Scotty

A relay maybe...???

ride5000

injector noise doesn't stop as the engine changes temperature.

ken

meilers

This is the noise from the solid lifters; it comes from the valve train, not the injectors. Totally normal; when they get bathed with enough warm oil (a few minutes after start) they go quiet.

jimr

I had a slight suspicion that it may have been valvetrain, but was afraid to consider that. So what happens to these parts (wear-wise) before the oil gets there?

I would imagine that the followers or buckets ride in a pressure-fed, machined relief in the head. It is scary to think that oil pressure isn't reaching these for 45-60-90 seconds!! ????

From looking at diagrams of the valvetrain on this motor, it looks like the cam lobes contact the followers (or adj shims) directly.....without lubrication, what is this doing to cam lobe wear at cold start up?

I will have to look at my oiling flow chart for this motor.

meilers

The oil is there, it is just cold, and thus it doesn't flow as well as it does warm. I first noticed this sound on my 02 WRX when I switched to synthetic oil of a slightly lighter viscosity than the dino oil before it; for some reason, the lighter oil made a difference.