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Old 08-26-2017, 11:15 PM   #11
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Mike,
I saw the documents, but looked to me like they were dated 1999. I wasn't sure if info was same for my 2006.
I downloaded the Mercruiser manual and read section on valves. It says valve lash is one turn down from zero lash. But you have info that says torque from zero lash. Do you think both are same torque levels?
One turn from zero lash is correct, I was thinking Ford on the torque spec. Was a Mustang guy in my youth guess hard to get Chevy embraced in my older years.
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Old 08-27-2017, 12:16 AM   #12
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I think you've forgotten more about engines than I have ever known.
I start troubleshooting tomorrow and will post my progress.
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Old 08-27-2017, 01:12 AM   #13
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One turn from zero lash is correct, I was thinking Ford on the torque spec. Was a Mustang guy in my youth guess hard to get Chevy embraced in my older years.


Are his rockers adjustable? The big blocks aren't.
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Old 08-27-2017, 04:35 AM   #14
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I think you've forgotten more about engines than I have ever known.
I start troubleshooting tomorrow and will post my progress.

Lol
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Old 08-27-2017, 04:35 AM   #15
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Are his rockers adjustable? The big blocks aren't.
Nope the stock rockers are not adjustable.
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Old 08-27-2017, 08:55 PM   #16
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Forgot to mention a tick could also be an exhaust leak.

Manifold to cylinder head.
I'm glad you remembered to mention exhaust leak because that is what I think it is.
I put stethoscope all along the valve covers and valves were smooth.
Found noise where port manifold meets engine block (cylinder head).
I think fix for this is new gasket. Merc manual only says install exhaust manifold gasket and torque to 25 lbs in discussions on assembly and disassembly. No guide on replacing just the gasket. Doesn't even have picture of this gasket in parts breakdown.

Has anyone replaced just the gasket? I'm wondering if I have to remove riser and elbow to replace the exhaust manifold gasket.
What is the effect of a leaking exhaust gasket, other than noise and fumes?

I appreciate the good comments and discussion on my problem. Mike and Speedy have been very helpful.
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Old 08-27-2017, 08:59 PM   #17
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Yes, it all comes off. You'll need new manifold gaskets and elbow (and riser if you have that too) gaskets. Pretty straight forward. Remove everything (manifold is heavy) clean surface with razor blade, and reassemble. I replaced all my manifold bolts with stainless and used some anti seize.
So where in OBX is the boat and have you ever taken it to or from Hampton Roads?
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Old 08-27-2017, 10:39 PM   #18
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Yes you'll need to remove the riser and manifold to get at the head to scrape away the old gasket from the head and manifold. Removing the riser requires a new gasket and cleaning as well. If old gasket is left behind it can cause a leak as the new one may not seal properly. Cheap fix and fairly easy labor.

Not fixing allows fresh air to be sucked in by backpressure which raises exhaust temps and can burn the exhaust valve. Also leaking exhaust gases are a safety risk for you.
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Old 08-27-2017, 11:55 PM   #19
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Thanks for the responses. Some questions to help plan repair:
- Do I need to separate the riser and manifold, or can I remove as a pair? I know this will be heavy. I have replaced riser gasket before and it was a challenge. I used Permatex to hold gasket in place but still had to get riser on just right the first time.
- Did you remover exhaust hose (rubber tube) from the riser, or keep it connected to riser? I'm trying to think of method that will result in least damage to hose.
- Should I address any corrosion issues I encounter? I have some excellent lightweight rust inhibitor.
regards and thanks, Randy

Speedy,
I keep my boat at a house in Southern Shores area of OBX most of the year. I boat the Currituck and Albemarle sounds. Lots of coves for fishing, crabbing, and water sports. Boat is at my house two months a year and I launch out of Bob's and Munden Point.
What is the name of your boat? I am at NOB Marina regularly. I would like to admire your fine vessel during next dock walk.
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Old 08-28-2017, 01:06 AM   #20
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The manifold and riser can be removed in one piece and the hose can be either disconnected from the riser or from its other end.

How old is the exhaust and is the water you boat in brackage or salt? If either it may be time to replace anyhow.

Corrosion should always be addressed.

Being 2006 it may have dryjoint, do you know?
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