Pulled her, have a project to work on….

aero3113 · September 26

2 weeks ago I was backing into a slip and heard a ticking sound on the port side. When I got into the slip I put her in neutral and didn’t hear anything. Reved a little and still no sound, same with bumping her into forward. Leaving to head back to home dock she jumped up and took off with no issues. Power seemed good, I didn’t want to firewall her just in case there was an issue. Next weekend we head out and all seemed good again, this time I gave more power and the port engine seemed like it didn’t want to go over 4000 RPM’s. I pulled back a little and tried again, this time she went up to around 4300-4500. Something didn’t seem right. Back at the slip I noticed a slight vibration on the port engine at idle. Decided to pull her, we had a great season and my daughter’s schedules were getting busy so it was a good time to pull her anyway. Pulled her on Monday had her shrink wrapped on Wednesday and today I started to dig in! No compression on the # 1 cylinder! Pulled the valve covers and all looked good. Stuck a borescope in the plug hole, piston and cylinder all looked great. The piston head did look super clean, could be a head gasket. I could only see half the valves, tough to tell but I don’t think the exhaust valve was fully seating, could be tuliped. Pulling the heads off to take a deeper look at it. More pictures to come in the following weeks.
Any tips for when it goes back together?Let me know!⚓️

captkevin · September 27

Fingers crossed for an easy fix

captkevin · September 27

Is this the same motor that had the spark plug issue earlier in the summer? If so any chance it is related? How does the oil look?

rasbury · September 27

Wow- you dove right in there didn't you!? If you are pulling heads you are out of my league- I understand the mechanics but don't have a machine shop!

aero3113 · September 27

@captkevin yes, same engine. Oil looked fine and the plugs that I replaced looked okay as well. They were a little sooty but not bad. It’s possible it’s related, curious what I’ll find once the head is off.

aero3113 · September 27

@rasbury you need to think of it as a giant Lego set or a model kit. Just need to remember how to put it all back together 😂

captkevin · September 27

Was the rocker arm loose on that cylinder? How many hours on motor?

aero3113 · September 27

No, not loose. I thought I read that a tight rocker would keep the valve from closing? only about 300 since the previous owner had it rebuilt.

captkevin · September 28

My guess is when you had the spark plug issue it burnt the valve

PickleRick · September 28

Would be nice to just need a valve job.

If you had a a leak down test gauge you could probably diagnose it in just a couple minutes before pulling the head.

aero3113 · September 28

@PickleRick I’m suspecting a bad head gasket as well so I’m just going to pull both heads. The piston head looks too clean to me. Also, I saw a small area where the head meets the block that looked clean also.

aero3113 · September 28

By the way @PickleRick the threaded rods you sent me are my favorite tools when pulling the manifolds!

PickleRick · September 28

I'm glad you're getting good use of the rods, I still have probably 4 ft or so left over. The only use it's gotten since cutting those two off were installing new nner seals in the front axle of the excursion and pressing new cam bearings into a rover engine. 6 ft of 3/8 all thread is a fairly versatile tool.

Hopefully you won't have a use for them again any time soon!

aero3113 · September 28

I hope I don’t!! ⚓️

rmrstlmo · September 29

A few years ago I had a clicking sound from my starboard engine. Turned out to be the head gasket was allowing cross firing between two cylinders. Good luck!

aero3113 · September 29

I pulled the intake manifold and heads today. I didn’t notice anything obvious on the cylinder that didn’t have any compression. The only thing I did notice was the coloring on the piston head, looks like the head gasket was leaking. I was searching the internet and someone on the SR forum had the same issue. All looked good but turned out to be a tuliped valve. I did find a cracked valve on the other head, opposite side (#2)! Luckily the cylinder and piston look good there as well. ⚓️

Image: https://us.v-cdn.net/5020499/uploads/editor/so/gdx3wa6n1ii2.jpeg

YYZRC · September 29

Best reuse of a wedding dress I've ever seen!

aero3113 · September 29

😂
It’s an old sheet I found in my basement!

captkevin · September 29

Whats next step?

Dream_Inn · September 29

How did #2 still have normal compression? Definitely would've failed the leak test. Are you planning to just replace valves on #1 & 2 and go with that? What's the rust hole in the pic of the #1 valves?

aero3113 · September 29

@Dream_Inn I never checked #2. I went right to #1 and saw there was no compression so I stopped and decided to pull both heads. I probably should kept checking but too late now! I going to have both heads checked and rebuilt at a machine shop. $325 per head. That is actually scale buildup at the passageway. I’m going to try and clean everything the best I can. This engine always showed 5-10 degrees warmer than the other, I’m curious if this is why.

aero3113 · September 29

captkevin said:

Whats next step?

Next the heads will go to the machine shop and I’ll give everything a good cleaning while I wait.

aero3113 · September 29

Besides your normal sockets and wrenches there was one special tool needed to disconnect the fuel line on the rail. I don’t know if there’s a way around this but I ordered a set that had a bunch of different sizes for $11. Easy to use, put it over the line push in and pull the hose off.

Ian · September 30

aero3113 said:

😂
It’s an old sheet I found in my basement!

Was going to say the wife will need the tablecloth for dinner time…

aero3113 · September 30

LoL!
Would be funny if it was and I just put it back on the table.

aero3113 · September 30

What blows me away is how heavy all these parts are. If they could all be aluminum, including the blocks it would be a 60+ mph boat!

PickleRick · September 30

With enough money one could install closed loop cooling along with aluminum heads/intake/block

aero3113 · September 30

I dropped the heads off at the machine shop this morning. He said I should them back by Friday or early next week. I cleaned the surfaces for the heads and intake today. I also cleared passages and got a bunch of scale out! I found a hose that has a cut in it. Hose is on order.

aero3113 · September 30

What do you guys think about these riser gaskets? Waaaayyyy cheaper than OEM.

https://a.co/d/dOOs4gg

captkevin · October 1

Wow that is alot scale. Be interesting to see how much better it runs.

aero3113 · October 1

Yes!
It was about a half container of cookie dough worth! LoL

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Pulled her, have a project to work on….

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