• If you log in, the ads disappear in the forum and gallery. If you need help logging in or getting registered, send request to: webmaster@southernairboat.com

Aircraft 0540 Rocker clatter

Southern Airboat Gallery Archives

Tilt trailer no carpet
My 350Z
Shuttle_and_DC-80001
poker for Pete in the Glades
Boars Nest Late 80
Airboat_complete_023
W

WallyGator

Well-known member
Is this a lifter or the rod and rocker? Do you need to stop and adjust the clearance when this starts. I have a JJ 0540 with 30 hours on it and one side is starting to rattle. I hear airboats all the time do it should I do somethig about it?
It is not loud but I did not have it before.
Pat
 
None of this is from the book, but I understood that the push rods are of different lengths and you have to change rods to change clearance.

BUT THAT MAY BE B.S..

I do know that some times the wrist pins can make noise as well if they were not replaced.

When in doubt call Junior Jurnigan.
 
Hey Wally I am assuming the JJ stands for juniuor jurnigan ?? if it does and it has 30 hours on it I would call him before I did anything. He is really good from what I hear and will probably fix it for you. just a thought.
 
My 540 has always made scary noise from the left bank, clanking and klunking, when the motor gets hot it goes away, I have checked the rockers and pushrods, looks ok. I figured it was lack of oil till things got lubed up.
 
the one thing bad about mufflers, now we get to hear all the strange sounds we could do without. when I put the bugscreen on the HD, It scares the crap outa me.
 
I've read that more than 90% of all engine wear occurs at start-up, because you've got parts rubbing together before you have oil pressure to seperate them. There are systems available that prelube an engine before start, and it's claimed that they double an engine's lifespan.

A cylinder called an accumulator is plumbed into the oil system that charges-up with oil to the max. pressure that your engine makes the last time it's run. It holds that oil under presssure until the next time you switch on the ignition, and then it releases it ...... you have oil pressure before the engine ever turns over. After start, it automatically recharges for the next time. Once the set-up is installed, it's all automatic after that.

Here's something else to consider. 20W50 oil gets to the lifters more than twice as fast at start-up as straight 50W. Oil sooner means less wear.

edit: a little help from a friend:

http://www.thinkauto.com/accumulators.htm

Ken
 
Okay here is the update. But a short story first.
This is the first built boat I have ever owned .What I mean by this is all my other boats were junk yard dogs. built on a budget of 500-3000 dollars and put together with old parts that other people trashed and I used.
Now the scoop
Called Jr J told him I have 30 hours on the motor and that I keep 11 quarts in the motor and that I do not run it hard at all.
He told me Mineral oil does not keep the Lifters up, run it hot(QUOTE"put a fire in it" and let the oil get down to 9 quarts then to change it.I have one of his chrome molly motors and he said I may need 50 hours to set the rings so check my oil usage and try to swap to high detergent and the noise will go away.
So what did I learn
1) babying it can be bad for the motor
2) 11 quarts is to much
3)break in may not be over till 50 hours
4)need to make it to more rides to put more time on the boat
another lesson shared with the crew.

Thanks foe allI have learned from this site
Pat
 
Bro. Jurnigan is the best of the rest when it comes to A/C engines.
If he says it, I believe it ....

All A/C engines should use a little oil. If they don't then they're way too tight. It has to do with them being a long stroke motor, which causes some huge pressure changes in their small crankcase when they're running. They will naturally pump a little oil, but that just keeps the valves guides happy. Not a problem.

K.
 
That is what Junior told me how to run the motor he did for us. I told him that I was planning to break it in according to the Lycoming manuel and then how should I run the engine. He said the worst thing I could do was baby the engine, and running it across the marsh would give the engine a work out while not blazing wide open across the water. I told him the boat would cruise at around 1700 and asked him if 2200 to 2400 rpms was to much. He said the good old boys around there would run them full bore and never had a problem.
 
Pat, consider this....
You've got a twin engined airplane. They've just replaced one of the engines, so now you've got one old one, and a new one.
You're sitting at the end of the runway, and cleared for take-off. Do you try to 'baby' the new engine, or do you just FLY the thing? Yup, you just fly it.

There's a big difference between using an engine, and abuseing an engine .... just using one won't hurt 'em.

Ken
 
You must log in or register to reply here.
Back
Top