Boat running bad!!!!... Won't hit full rpms!!!!...

[zildjian29]

Re: Boat running bad!!!!... Won't hit full rpms!!!!...

I'm not getting full speed or rpms either and have tried different props! Have a couple friends with the same setup and there fine. 19p prop only 4000 rpm at 31mph. I'm losing power somewhere! Gonna check point gap , timing and advance then carb.

 

[zildjian29]

Timing help please!!!!.....

Timing help please!!!!.....

Ok so my timing was way off and when i say way off it was not even close to the tab! It's a mercruiser 3.0 140hp. year 1985. From what iv'e read timing should be 6 before tdc. Now my question is when i adjust the timing it makes it idle faster! So should i start with the idle at 700rpms then set it then turn the idle down with the idle screw?

 

[500dollar744ti]

Re: Timing help please!!!!.....

Re: Timing help please!!!!.....

You should set your idle, then set your base timing, keep adjusting until right because one will affect the other.

 

[zildjian29]

Re: Boat running bad!!!!... Won't hit full rpms!!!!...

Ok guys so the timing was way off! Problem im having is when i adjust the timing to specification the idle goes up so do i set it then turn idle down at adjustment screw? Should it speed up or slow down while turning the distributor?

 

[achris]

Re: Timing help please!!!!.....

Re: Timing help please!!!!.....

Points or DDIS?

With DDIS you need to get the engine into base timing mode. (obviously with points you don't)...

But with either system, adjust the idle speed down to 700, then start moving the timing. If the idle speed changes, adjust it back to 700 as you move the timing. The spec for timing is x degrees at 700rpm...

Chris....

 

[zildjian29]

Re: Timing help please!!!!.....

Re: Timing help please!!!!.....

The problem im having with that is mine doesn't have the wires that the manual says to disconnect and then the wires to jump!

 

[500dollar744ti]

Re: Timing help please!!!!.....

Re: Timing help please!!!!.....

Does it have points then?

 

[zildjian29]

Re: Timing help please!!!!.....

Re: Timing help please!!!!.....

That is what i thought to chris. I have seen different anwsers for the degree! some say 6 some say 8 some say 0. so which is it? Forgive for not knowing what you mean by x.

 

[zildjian29]

Re: Timing help please!!!!.....

Re: Timing help please!!!!.....

yes points!

 

[zildjian29]

Re: Timing help please!!!!.....

Re: Timing help please!!!!.....

Also after i adjust the timing then turn idle back to 700rpm the timing mark moves also. I dont get it

 

[achris]

Re: Timing help please!!!!.....

Re: Timing help please!!!!.....

Points... No wires to cut/disconnect/join.... Just run the engine, point the timing light at the marks and adjust to 6 degrees BTDC....

(The 'x' was just representative of any number. I hadn't looked it up, just making a point)

Chris.....

 

[achris]

Re: Timing help please!!!!.....

Re: Timing help please!!!!.....

Also after i adjust the timing then turn idle back to 700rpm the timing mark moves also. I dont get it

Because the timing advance is affected by engine speed. Set the idle speed at 700, start adjusting the timing. If the idle speed changes (and it will), adjust the idle speed back to 700, and keep adjusting until you have 6 degrees BTDC at 700.....

Chris.....

 

[zildjian29]

Re: Timing help please!!!!.....

Re: Timing help please!!!!.....

Awesome i got it then!!!.... you can tell a big difference already just on the muffs! before it would rev up but kinda bog down a little first and now it revs up super clean. Thanks a bunch i appreciate it.

 

[achris]

Re: Boat running bad!!!!... Won't hit full rpms!!!!...

Ok guys so the timing was way off! Problem im having is when i adjust the timing to specification the idle goes up so do i set it then turn idle down at adjustment screw? Should it speed up or slow down while turning the distributor?

You're started this question in another thread, and I've given you the full answer on it there....

Please don't start 2 threads on the same issue... VERY confusing, for all of us....

http://forums.iboats.com/mercruiser-i-o-inboard-engines-outdrives/timing-help-please-622900.html

 

[achris]

Re: Timing help please!!!!.....

Re: Timing help please!!!!.....

You might (will) want to check that the advance mechanism inside the distributor is working properly.... Use the advance chart in the service manual and check that the timing is doing the right thing as the engine speed increases...

Chris......

 

[zildjian29]

Re: Boat running bad!!!!... Won't hit full rpms!!!!...

Will do thanks!

 

[zildjian29]

Re: Boat running bad!!!!... Won't hit full rpms!!!!...

This manual sucks! What should the timing advance to when accelerating? I need to just buy a manual instead of using online versions! Everything has been checked its the timing! I have it set at 6? before FCC just need to know how much it should advance.

 

[zildjian29]

Re: Boat running bad!!!!... Won't hit full rpms!!!!...

OK from what I understand it should advance to 12? at 2000rpms and about 24 to 25? wot.

 

[achris]

Re: Boat running bad!!!!... Won't hit full rpms!!!!...

This manual sucks! ...

Which manual?

OK from what I understand it should advance to 12? at 2000rpms and about 24 to 25? wot.

Here's the advance curve for you...

Chris....

 

[zildjian29]

Re: Boat running bad!!!!... Won't hit full rpms!!!!...

Thanks! I noticed when I changed the timing I got ticking sound from the engine. Kinda hard to judge the advance because the marks only go to 12? but I'm sure I can eyeball it. It help the boat a little bit now I can get over 4000 rpms but something still isn't right! It doesn't stall so easy while giving throttle but when wot it kinda revs up and down a little. And my idle sticks a tiny bit it doesn't like to got back down to regular idle unless you tap the lever by the carb!!!!.. I'm going to have to break down and take it to the damn marina!!!!... arrrrrgh

...... Jason