[brian sutton]

The adjustment for the exhaust valve should have said “can be spaced as much as 0.019 before adjustment is needed”.
The way I explaind the procedure sounds confusing but basicly I was saying,with the firing order 1-3-4-2, when the valves are open for cylinder 1–>adjust valves for cylinder 4.
Open valves on cylinder 3 –> adjust valves for cylinder 2.
” ” ” ” 4 –> ” ” ” ” 1.
” ” ” ” 2 –> ” ” ” ” 3.
Theory being when one valve is open (at the top of lobe on camshaft) the sister pistons valves are 180 degrees on the other side on the cam lobe where the adjustment is suposed to be made, right?
1-3
4-2

[brian sutton]

Thanks for the replies,

1) I believe the motor is  a 2011-12? 4lha-stp

2) heat excganger,air cooler,oil cooler and gear coolers were removed,end caps taken off and cleaned last fall.Pic of trans cooler is provided.

3) I keep a close eye on zinks and change as needed.

4) lm useing Prestone dex-cool aproved,extended life coolent and changed it after one season.

5) I change the raw water impeller yearly.

6) I installed a fresh water flush this spring.

7) Trans- ZF 63A-1.6, ratio 1.56:1,change fluid yearly.

8) primary fuel filter,racor dual w/30 micron eliments.

9) belt is checked and adjusted often.

10) 4 blade prop-original rpm 3175 ( photo tach) repitched to 3300,repitched again and should get 4300-4500 rpm.

11) installed aetna tach.

12) have Not had the valves adjusted,873 hrs.

Note: I put around 200 hrs on boat yearly, 1/3 wk end getaways and 2/3 fishing GBT (giant bluefin tuna).Have not done any slow trolling (yet).

The cofiguation of exhaust has not changed although elbows were replaced with 316 ss.

The lower side of mixing elbow is about 13″ obove water line.Also a Centec FRP acoustic silencer is installed.

 

Q: does my turbo look like it needs to be turbo wased? What do you clean your turbo with?

How often so you change coolant,can you get two years out of it?

Do you use any fuel additives,I do not have access to look inside fuel tanks but have not had any signs of water or any filter fowling?

Do you use any type of corrosion guard on entire motor?

Thank You,

Brian

 

 

 

 

[brian sutton]

I replaced riser and mixer elbows with 316 stainless steel.ill keep a close eye on it.I think its a bad place for cast iron and/or low grade ss when it is sitting idle for 5-6 month.

[brian sutton]

These arw pics after I wiped them off

[brian sutton]

Additional thoughts, I did notice when I took the exhaust hose off the mixer, I inserted a video scope down the mixer and into the riser elbow and noticed it had some damp/wet crud on it when I pulled it out and that was before I started it up after the winter layup (just wondering why it would be damp/wet after sitting for 5 month).

Also if a cracked exhaust manifold from being overheated is causing coolant to enter the turbo,could/would a good coolant cause this kind of rust in say 9 month, the first 3 the boat in use and the rest boat was layed up for winter. Brian

[brian sutton]

Sorry for the upside down pics.

I have read that water can enter the

turbo by,

1) a bad mixing elbow

2) a cracked exhaust manifold ( I dont recall adding coolant last season)

3) a badly designed exhaust system

Full disclsure I did overheat the motor once from not opening seacock (I now have a seperate alarm for that). Any thoughts? I would be happy to provide any aditional info requested.

Thank you,Brian

 

[brian sutton]

More pics

[brian sutton]

Ok, I have several pics to post.Their does appear to be some moisture getting into the exhaust side of the turbo.Do not believe any water is backing up through the exhaust do to the steep angle exiting the mixer?The obvious place for water to come from would be where the raw water inters the mixing elbow because where it comes in the mixer drops straight down to the elbow that goes to the turbo.Any sugestions would be greatly appriciated.

Brian

[Author]

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