Broken Intake Valve
04-13-2009, 08:34 PM
#5
Platinum Member
Platinum Member
Join Date: Jul 2008
Location: Little River SC
Posts: 931
Likes: 0
Received 0 Likes
on
0 Posts
Try to see who makes that valve, I have seen pitting on valves from water on mostly the stem side, thats really strange! Looks like the valve rotates to one spot then begins to remove material, I take it the engine would back-fire through the intake.
04-14-2009, 05:02 AM
#6
Registered
Thread Starter
Join Date: Jul 2006
Posts: 43
Likes: 0
Received 0 Likes
on
0 Posts
As far as I know, the valves are factory but I'll check today. The engine actually ran fine with no backfire. I'm tearing it down due to a bit of oil consumption and found this by surprise.
04-14-2009, 05:13 AM
#7
Registered
Platinum Member
Are you the original owner of the boat?
Are all the valves this way, or just a few?
There is a lot on info out there that would help, like what kind of engine is this? How, old, how many hours, salt/fresh water?
Are all the valves this way, or just a few?
There is a lot on info out there that would help, like what kind of engine is this? How, old, how many hours, salt/fresh water?
04-14-2009, 03:36 PM
#10
Registered
Thread Starter
Join Date: Jul 2006
Posts: 43
Likes: 0
Received 0 Likes
on
0 Posts
It is only one valve that has done this. The engine is a 9.0:1 454 with fact rectangles (088's). The valve are original from merc and have approx 100 hours on a valve job. I don't know the total number of hours. The cam is stock with 1.8 rockers and the exhaust is stock as well. It is used in fresh water only. The engine was tuned with a LM-1 and ran approx 12.5:1 at wot.
