Timing Question

[stump1234]

How do I check the timing on a 2004 150 xl ot961925 mercury when it says on the emission label that the timing in degrees is not adjustable. I don't have a 878079ro1 manual

 

[GA_Boater]

Your new thread stump1234

You have a better chance of getting your questions answered with a new thread instead of asking in a 5 year old inactive thread.

You should look at getting a manual.

 

[achris]

The timing on an outboard doesn't work the same as a car engine. With a car engine you set the initial timing and the advance curve takes care of the rest. With an outboard you set the maximum advance (at WOT) and then adjust the timing at idle to get the right idle speed. There are also adjustments for the relationship between timing and carburettor positions. I have cut and paste the relevant sections from the manual to show you the specs for your engine. But you do need the manual to set it all up correctly (it's 6 pages worth)...

Chris.......

 

[racerone]

As stated timing does not change over the life of the motor.----So what is your motor doing / not doing ?

 

[stump1234]

I just purchased the boat and it sat for about two years, I was able to get the motor running but it ran at 2500 rpms at idle. I pulled the thermo valve and it opened as it should so now it will idle around 1500 rpms, The oil system has been taking out so no adjustment on the oil system.. I want to do a link and syn on the two adjustment screws which are the only adjustments left. I want to set the base and wot. the but the the emission label says timing in degrees is non adjustable.. I was going to start a new post but I cant figure how too.. The manual I need is 90-878079ro1

 

[stump1234]

and thanks chris but those engine listed are not mine I have a 2004 mercury 150xl swb ot961925

 

[achris]

and thanks chris but those engine listed are not mine I have a 2004 mercury 150xl swb ot961925

It is, it's called an XR6....

 

[stump1234]

Ok achris why does it say on the emission label timining in degrees is not adjustable? so I should have timing at 0-9 ATDC and cranking speed at 25 BTDC and 19 BTDC I have a service manual number og960500 and above can I use that as my guide. How did you determine it is a xr6?

 

[stump1234]

26 BTDC and 20 BTDC

 

[racerone]

Be very careful if you insist on making timing adjustments.

 

[achris]

.... How did you determine it is a xr6?

Having been a certified Merc tech since 1995 might have something to do with it....

You may also wish to have a look at the copy from the manual I have posted below too...
135 is carbed
150XRi is 150hp EFI
XR6 is 150hp carbed.

Chris.......

 

[achris]

Ok achris why does it say on the emission label timining in degrees is not adjustable? so I should have timing at 0-9 ATDC and cranking speed at 25 BTDC and 19 BTDC I have a service manual number og960500 and above can I use that as my guide. How did you determine it is a xr6?

ok... when playing with outboard 'link and sync', first we check/set the pointer position, then we check/set the maximum advance, the full throttle stop, the primary throttle pickup (if applicable) and idle speed. The idle speed is set to an actual engine speed (~650rpm), by adjusting the timing. You don't set the timing to a specific setting, it will be in the range specified when the RPM is correct.

If you haven't done this before, read through the manual several times before you go near an engine.

The 2 advance settings given as maximum advance, one is the setting at cranking speed (~300rpm) the other at WOT. If you are setting the max advance at home/workshop where you can't have the engine running at WOT (without destroying it), then you set it to 26 degrees of advance. Because of characteristics of the igntion system, at the actual WOT (~5500rpm) the advance will be 20 degrees.

Step 1. Check the pointer position
2. Set the carbs to be all opening and closing together.
3. Have the throttle roller set to the right position
4. Set throttle maximum stop
5. Check carb/oil pump sync
6. Check trigger link rod length
7. Set maximum timing
8. Set idle speed with primary pickup

That that, in a nutshell, is how to set up an outboard, but unless the engine has had a strip down or major parts replaced, it should never need adjusting....

Chris.......

Please post a photo of the timing label... (it may be something we don't see in Oz)

 

[Dukedog]

his is a plain jane 150 carb... not xr6... 0t961925.... Service Literature for MERCURY CARBURETED SALTWATER 150 XL SW..... probably just a 2.0 motor... if it has an alternator type and cps system then timing IS NOT adjustable..... ecm and cps determine justa 'bout everything....

The ECM performs the following functions: • Calculates the precise fuel and ignition timing requirements based on engine speed, throttle position, manifold pressure and coolant temperature. • Controls fuel injectors for each cylinder and ignition for each cylinder. • Controls all alarm horn functions. • Supplies tachometer signal to gauge. • Controls RPM limit function. • Contains detonation control circuitry. • Records engine running information.

 

[stump1234]

Tried to upload label emission but it wont wont upload.and the tach does not work no fuel injectors. I like everything dukedog listing was saying except for the injectors that this engine does not have..I did not touch the wot adjustment screw just the idle screwto try and bring down the rpm.I know the thermo valve was stuck because after I took it out and heated the water to 100 the valve opened and the rpms went down to 1500 rpms and I can put my finger on the other hole opening of the thermo valve and the rpms will increase.. Do I need to disconnect the plugs and ground the wires to do the base timing..to see if I have 26BTDC

 

[Dukedog]

efi or carb makes no difference with that motor... it still has ecm and crank position sensor that controls almost everything... any merc that uses a cps will not need timing set manually.... if it has a sticker that says leave it alone then thats what ya need ta do.... but do what ya want... get tha manual for it before ya turn any screw on it....... jmo

 

[stump1234]

label

 

[stump1234]

https://www.youtube.com/watch?v=iTJyrf9m_oE now this is a good video

 

[GA_Boater]

[IM G]https://attachment.outlook.office.net/owa/mmcgoss@hotmail.com/service.svc/s/GetAttachmentThumbnail?id=AQMkADAwATExAGMyOC00OWI1 LTkzOGMtMDACLTAwCgBGAAAD9G6h6W9%2F5EO6W%2FjZK%2BXa egcAcsXj0s9dhEuLwcAySx1KGAAAAgEMAAAAcsXj0s9dhEuLwc AySx1KGAAAAKYoubQAAAABEgAQAPuB5n6rQ%2FRCiE5Wsrwrm4 g%3D&thumbnailType=2&X-OWA-CANARY=prFzUZx_OUqk4DKZ7aM_KwAzOH60LdQYNXWkWXj_3-HgRzZqTEqkkFOXhD4n2gNMX5mNi8orrEQ.&token=75ba12b0-de3d-435e-8afe-e6628deeaeb7&owa=outlook.live.com&isc=1[/IMG]label

I think you are trying to use Outlook to attach the label pic looking at the above. That won't work, stump.

Click at the Forum Help in the sig below and look at the pic posting tutorial - Option 3 works best, but you need a photo hosting service.

 

[stump1234]

oh ok thanks I will look into that

 

[achris]

his is a plain jane 150 carb... not xr6... 0t961925.... Service Literature for MERCURY CARBURETED SALTWATER 150 XL SW..... probably just a 2.0 motor... if it has an alternator type and cps system then timing IS NOT adjustable..... ecm and cps determine justa 'bout everything....

The ECM performs the following functions: • Calculates the precise fuel and ignition timing requirements based on engine speed, throttle position, manifold pressure and coolant temperature. • Controls fuel injectors for each cylinder and ignition for each cylinder. • Controls all alarm horn functions. • Supplies tachometer signal to gauge. • Controls RPM limit function. • Contains detonation control circuitry. • Records engine running information.

First line you say CARBURETORED (as recognised by the Merc serial number site), then you go one to discribe an EFI ECM controlled engine. And it isn't a 2 litre engine, it's 2.5litre.

Chris......