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The mkiv Supra Owners Club

Growl type noise at around 3000rpm


Richie_k83

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  • 1 month later...

So i tried the nut a while back and it did nothing.. Thinking it might be cam/valve related...

Going by that, i stripped the head down, cams and caps look good. So i pulled the cam buckets. All look good apart from cylinder 1 on the inlet side

 

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Does anyone think this pitting could be a likely cause?

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It wouldn't make a growling noise, but they could tap. Looks like the oil has been water contaminated, or the head stored somewhere damp. You need to measure the tappet bucket to bore clearances, and that needs specialist gear. Those buckets look `orrible! If the clearances are excessive the heads effectively scrap, assuming all the wear isn't in the buckets themselves (it won't be....).

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It wouldn't make a growling noise, but they could tap. Looks like the oil has been water contaminated, or the head stored somewhere damp. You need to measure the tappet bucket to bore clearances, and that needs specialist gear. Those buckets look `orrible! If the clearances are excessive the heads effectively scrap, assuming all the wear isn't in the buckets themselves (it won't be....).

 

Thanks Chris, did you watch the video i put up earlier on this thread?

 

The noise wasn't there all the time, you could accelerate hard and its fine, right until you lift off the gas and the engine is not under any load it was there (on over run)

 

Could that be excessive crank float? It doesn't have the oe crank pulley and i don't know how long its been on there

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Tappet buckets tap when worn, you'd be hard pressed to hear even bad ones inside the car. Excess crank float can give a dull thud when engaging a gear, certainly no growl unless they are shot to pieces. how much end float is there? I would never use a none OE damper, but I doubt that's your problem. I'll try and look at the video later.

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Tappet buckets tap when worn, you'd be hard pressed to hear even bad ones inside the car. Excess crank float can give a dull thud when engaging a gear, certainly no growl unless they are shot to pieces. how much end float is there? I would never use a none OE damper, but I doubt that's your problem. I'll try and look at the video later.

 

Not sure on the end float, never measured it before. Will have a look.

 

Thanks for your help so far :)

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  • 3 weeks later...

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