|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
02-14-2021, 05:42 PM | #1 |
Senior Member
|
8BA noisy valve update
Pulled heads and intake and found 8 valves with excessive valve lash
Used the #1 TDC compression, adjust both valves, rotate 90 degrees, the adjust both valves based on firing order. Worked great, found 8 valves with excessive lash and replaced with NORS TRW valves ground to fit. Started engine today, valves are quiet but have a knock at idle that seems to disappear when revving engine. Suspect head clearance or rod hitting 8RT oil pan. Haven’t checked anything yet, a little frustrated at this point. Question..If I short out each cylinder one at a time will I be able to isolate a head clearance problem? What’s the best method ? Thanks, Bob |
02-14-2021, 05:51 PM | #2 |
Senior Member
Join Date: May 2010
Location: Qld, Australia
Posts: 4,215
|
Re: 8BA noisy valve update
NO, you may be lucky enough to look in to the piston with one of those cameras on a stick thing, but head off is the best way.
Lawrie |
Sponsored Links (Register now to hide all advertisements) |
|
02-14-2021, 06:09 PM | #3 |
Senior Member
Join Date: Jan 2011
Posts: 342
|
Re: 8BA noisy valve update
Had a fresh built "36 lb that had a slight knock at idle that went away as revs went up. Ended up the machinist had put in only seven new wrist pin bushings. Old one was the knock.
|
02-14-2021, 06:18 PM | #4 |
Senior Member
Join Date: May 2010
Location: Solihull, England.
Posts: 8,749
|
Re: 8BA noisy valve update
Piston to head clearance would be ok at idle but noisier when revved.
I didn't realise it at the time, but I had that problem with this motor in this video from 2010. https://youtu.be/hBuyhSecfyo You can hear the knocking when I rev it. |
02-14-2021, 06:29 PM | #5 |
Senior Member
|
Re: 8BA noisy valve update
That’s a possibility, should show up shorting out the cylinders, I would think.
|
02-14-2021, 07:10 PM | #6 |
Senior Member
|
Re: 8BA noisy valve update
Sponsored Links (Register now to hide all advertisements)
Doesn’t sound like my knock is a head clearance problem after reviewing your info and the audio of your knock. |
|
|
Sponsored Links (Register now to hide all advertisements) |
|