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[red80]

th

[thomo]

Have you had the valve clearences done lately?

[dandownunder]

It could be tappets, My Surf does the same thing, or only with fresh oil for the first 1500k's on fresh oil then the noise dissapears, haven't attempted adjusting the valves on them, don't think they are adjustable on mine ?

[red80]

i would have thought the valves would have made right through the rev range not only at 2000rpm ? But I havent checked them lately, bugger of a job

[beanz2]

Mine has a ticking audible around the same range and it comes from the wax pellet device (ASCD = Assisted Cold Start Device?) on the fuel pump. The sound disappears when the lever is forced forward off the plunger on the device. Been meaning to fix it, but too lazy

Dave

[red80]

where is it on the pump (ACSD) is it more of a rattle? Mine makes a rythmic tapping noise not so much a rattle, wondering if it might be just piston slap

[beanz2]

The ACSD is the device that has a coolant line going in and out of the back. The plunger presses on a spring loaded arm to the side opposite from the engine. The noise on mine is a rhythmic tapping as well.

Dave

[dow50r]

1 HD-T has a ticking noise around 2000rpm, only under acceleration or free revving not on deceleration, I checked and replaced big ends (doesn't sound like bearings anyway) and have reco'd all injectors, doesn't loose power and I don't think it's exhaust leak. Could this be the pump or timimg? any ideas diesel gurus

I think you hit it in one...have the timing checked by someone with a diesel timing light....it will probably be too advanced.
Andrew

[alchemist]

My 1HD-FT had a ticking noise for a while then I broke a rocker bridge and bent a valve which the piston hit... cost me a rebuild... make sure you get the tappets adjusted... i think my engine failed because of worn collets tho.