Notices

454 Knocking - Top End??

Thread Tools
 
Old 06-07-2025 | 09:11 PM
  #11  
Registered
20 Year Member
 
Joined: Jan 2006
Posts: 3,601
Likes: 1,169
From: taxachusetts
Default

who did you get the lifters from?
sutphen 30 is offline  
Reply
Old 06-08-2025 | 01:02 AM
  #12  
Thread Starter
Registered
 
Joined: Dec 2024
Posts: 17
Likes: 0
Default

Originally Posted by sutphen 30
who did you get the lifters from?
I bought the boat with this engine on the basis of a survey that said it ran well, and the owner having spent ~ $5k having the top end rebuilt (skimmed & valve seats). Clearly the last owner has fancied himself an engine builder - the heads are not original casting#6272292, and the cam has been swapped at some point. I would say based on my teardown that the lifters were also replaced when the heads were refreshed, they look brand new.

Afraid I have no records to say where they came from.

Thanks
Will
drumwilldrum is offline  
Reply
Old 06-08-2025 | 12:54 PM
  #13  
Registered
20 Year Member
 
Joined: Oct 2005
Posts: 1,077
Likes: 254
From: Waldorf, Md
Default

Originally Posted by drumwilldrum
Hi All,

Just an update on this - after the leaving the boat alone for a week whilst I sourced gaskets, oil had drained back to sump and slivers of copper clearly visible in heads and v of engine.

Likely thrust bearing or a very worn big end I am told. Looks like the engine is coming out.

This happened on the first trip out after changing the oil filter ~ just coincidence or something I did wrong here?

Thanks
Will
Make sure that isnt from copper colored valve spring shims. It kind of rare from bearing material to get to the heads and valley area. Almost impossible for it to get to the heads.
BillK is offline  
Reply
Old 06-08-2025 | 02:40 PM
  #14  
Thread Starter
Registered
 
Joined: Dec 2024
Posts: 17
Likes: 0
Default

Originally Posted by BillK
Make sure that isnt from copper colored valve spring shims. It kind of rare from bearing material to get to the heads and valley area. Almost impossible for it to get to the heads.
oh man the plot thickens .. I was about to pull the trigger on a rebuild.

So I guess it would be worth running it at least now I have rebuilt the valve train - I pulled all the lifters, cleaned them and set the lash, then saw the copper and figured an immediate write off..
drumwilldrum is offline  
Reply
Old 06-08-2025 | 06:10 PM
  #15  
Registered
20 Year Member
 
Joined: Oct 2005
Posts: 1,077
Likes: 254
From: Waldorf, Md
Default

Originally Posted by drumwilldrum
oh man the plot thickens .. I was about to pull the trigger on a rebuild.

So I guess it would be worth running it at least now I have rebuilt the valve train - I pulled all the lifters, cleaned them and set the lash, then saw the copper and figured an immediate write off..
Could be. I would run it a half hour or so on the muffs and then pull the filter and cut it open and look for metal. If its clean run it an hour or so easy in the water and look at the filter again.
BillK is offline  
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.