Isx15 2350 knock.

[Beardedtrucker]

So lately I’ve been experiencing a knock on the turbo side on cold starts. Once the oil temp has come up it goes away. So it last a good 10 minutes and sounds pretty nasty. Isx15 2350 575k miles. Deleted.

Everyone says it’s fuel related, but I keep going to haggai and my fuel system checks out. Last visit to check out fuel was 3 weeks ago. I hate to keep bugging them due to my paranoia. The knocking happened after a trip I took and noticed it. Before that trip the harmonic balancer was replaced due to general maintenance. I got the advice to change it from my last post on concern of a weird vibration. I didn’t change the balancer a shop did. Could that be the reason for a cold knock? Thanks.

[Rawze]

Is it noisy valve lash (rattling valve train) when it is cold?.. or an actual knock?.

And what did Mr. Hags say about it?.

[SquareOne]

Maybe post a video clip?

[Beardedtrucker]

It’s definitely a knock. By the time I get to the shop it’s warm and goes away. I sent a video to Allison once and she said it sounds like fuel knock. But isn’t sure. I leave on a trip in the morning I’ll try to get a video and get it posted. Hope it’s nothing major

[marek4792]

If the damper isn't oem it maybe of concern. Fly wheel? Clutch?

[Beardedtrucker]

As soon as the oil temp reaches 125 that knock goes away.
Tried to attach file to post but said it wasn’t allowed so I uploaded it to YouTube.
https://youtube.com/shorts/bsmGppxVU-w?feature=share

[Rawze]

(02-20-2023 )Beardedtrucker Wrote:  As soon as the oil temp reaches 125 that knock goes away.
Tried to attach file to post but said it wasn’t allowed so I uploaded it to YouTube.
https://youtube.com/shorts/bsmGppxVU-w?feature=share

sounds like a diesel engine to me.

[SquareOne]

Is that video a cold start? Are you hearing the knocking there?

[Beardedtrucker]

Yeah hopefully it’s just my paranoia. This thing use to be quiet. If it makes a difference this morning taking off blue smoke came out of the exhaust a little.