spark, compression, fuel but not starting

[COL BRADDOCK]

Gents,

My engine turns over but will not start.

I have:

Compression is good and it ran a couple of days ago out of the boat
spark it good and bright blue
fuel (got a can running to the fuel pump to ensure it was good fuel.
New battery and fully charged
Carb is squirting fuel when I open the valve

Symptoms
-engine turns over continuously with the plugs out
-engine cranks for 4-5 seconds then the starter disengages the flywheel and continues to turn as if it no longer has enough power to keep the starter engaged.

I started the engine prior to putting it in the boat and it ran fine. starter worked fine as well(I had another starter kicking around so I put that in and the same symptoms were present.
Shift interrupter wires are disconnected to isolate that problem.(is this correct?) For now until I can get an interrupter on order. (wasn't on the motor..Just the two wires it connects to.
-pulled the starter and the bendix moves freely all the way out. teeth are good.

Is it possible I have a bad ground somewhere on the engine? Where to start the trouble shooting?

Any trouble shooting help would be much appreciated as the 58 centimeters of snow we got on the weekend is melting and I'd like to get this project on the water...

 

[Don S]

Re: spark, compression, fuel but not starting

Bad grounds, bad cables, loose ends on the cables, loose or dirty connections on either end of the cables.

Check them all.

 

[towerclimber]

Re: spark, compression, fuel but not starting

I have a 86 4cyc. Mercruser that i had running all last year after having new head put on it. 3 weeks ago we started it up and ran for 30 min. Then it just quit. It will turn over i have compression good spark and I'm getting fuel into the Intake. Here's the best part. I'm not getting fuel into the cylinders. I cleaned all the plus and tried to start it with starter fluid and gas then pulled the plugs they are dry as could be. What could it be stopping the fuel from getting into the cylinder?

 

[achris]

Re: spark, compression, fuel but not starting

I have a 86 4cyc. Mercruser that i had running all last year after having new head put on it. 3 weeks ago we started it up and ran for 30 min. Then it just quit. It will turn over i have compression good spark and I'm getting fuel into the Intake. Here's the best part. I'm not getting fuel into the cylinders. I cleaned all the plus and tried to start it with starter fluid and gas then pulled the plugs they are dry as could be. What could it be stopping the fuel from getting into the cylinder?

TC, this is a current thread, please start your own and not hijack someone elses...

 

[towerclimber]

Re: spark, compression, fuel but not starting

TC, this is a current thread, please start your own and not hijack someone elses...

What are you the forums police. Its the same topic different problem.

 

[Don S]

Re: spark, compression, fuel but not starting

What are you the forums police. Its the same topic different problem.

No, he isn't, but I am. If you visit our forum rules and the anouncement at the top of this forum, you will discover that you should start a new thread with your question and not hijack someone elses thread with your question. That's just rude.

 

[JB]

Re: spark, compression, fuel but not starting

Same topic, different problem is a hijack, TC. It is very bad form. Start your own thread.

Yes, I am the forum police.

Thanks for your cooperation.

EDIT: Great minds. Don just types faster than I do, but I am old and decrepit.

 

[WIMUSKY]

Re: spark, compression, fuel but not starting

Hey TC, I see you're a new member. Here's the announcement:
Announcement: Help Tip: If you have a question that has not been answered to your satisfaction in the archives, it is always best to start a new thread of your own. By starting your own thread, you will receive the maximum number of views by forum members.
BradC-iboats (Administrator)

Also, it would be best to familiarize yourself with the forum rules:
http://forums.iboats.com/forum-rules-guidelines/forum-rules-397820.html

Hope this helps......

 

[achris]

Re: spark, compression, fuel but not starting

EDIT: Great minds. Don just types faster than I do, but I am old and decrepit.

You know, I've always found it interesting... For each of those types of sayings there is an opposite...

A silent man is a wise one.... A man without words is a man without thoughts.
Actions speak louder than words..... The pen is mightier than the sword.
Beware of Greeks bearing gifts..... Don't look a gift horse in the mouth.
Clothes make the man...... Don't judge a book by its cover.
Look before you leap.... He who hesitates is lost.
Many hands make light work..... Too many cooks spoil the broth.
Nothing ventured, nothing gained..... Better safe than sorry.
Great minds think alike... Fools seldom differ...

Just kidding JB....

Cheers,

Chris........

 

[COL BRADDOCK]

Re: spark, compression, fuel but not starting

Cleaned all connections and pulled the starter and had it bench tested. Starter checks out. New battery cable as well. Would the next step be the ignition?

 

[achris]

Re: spark, compression, fuel but not starting

Could the dissy have moved? I'd be putting a timing light on it and making sure it's firing AT THE RIGHT time....

Chris......

 

[spdracr39]

Re: spark, compression, fuel but not starting

Or incorrect firing order. Check that too.

 

[COL BRADDOCK]

Re: spark, compression, fuel but not starting

Found the problem....the coupler was not the correct part and was not holding the flywheel on snug so it would wobble throwing the starter off. Pulled the motor and corrected the problem.

Thanks for all the input..very valuable!
Onto the next issue...