• Welcome to The Truck Stop! We see you haven't REGISTERED yet.

    Your truck knowledge is missing!
    • Registration is FREE , all we need is your birthday and email. (We don't share ANY data with ANYONE)
    • We have tons of knowledge here for your diesel truck!
    • Post your own topics and reply to existing threads to help others out!
    • NO ADS! The site is fully functional and ad free!
    CLICK HERE TO REGISTER!

    Problems registering? Click here to contact us!

    Already registered, but need a PASSWORD RESET? CLICK HERE TO RESET YOUR PASSWORD!

How can you tell if the timing is too far advanced?

turbovanman

turbovanman

I has boost, :O)
Messages
1,554
Reaction score
142
Location
Abbotsford
When I put the new/used pump in, I lined up the marks then gave it aprox 1-2mm more. When it starts cold, its LOUD, then quietens up of course, but to me, its still very noisey, so how can I check it or should I move it back-which is a ROYAL PITA, :mad2: Power is good but I will be putting a turbo on soon so I don't want to blow it up.
 
well...The right way is with the Kent Moore timing light designed for the engine but good luck finding one. It should sound a little marlbley. My 6.2 is actually pretty loud and timing AFAIK has never been screwed with. The 6.2 tend to be a little louder than the 6.5s IMHO. If it's running good and starts fine it's probably ok. if it's too noisy try retarding it a touch. If you go too far it won't start good. I have never seen one with the marks lined up. Always seems to be a very slight to drivers side. About the best I can offer you.
 
Retarded timing will see hard starts and possible smoke at idle even when warm..

You can look around and find a timing adapter that will read the pulse from the injector line and these will trigger a regular timing light.

The LUMI MAG diesel timing tool is the best to use.

These have a Luminosity probe that goes into the glow plug hole and triggers the thing.

The measure the begining of combustion with the probe sensing the start of combustion in the precup.

Watch ebay or craigs list


Missy
 
The Kent Moore ones show up on ebay once in awhile too. I missed on a year ago . Sold for like 60$ . I've always managed without it. I never really felt the 6.2 was that finicky.
 
My IP is just a notch to the driver's side and it's not super marbley but not quiet either.

Here's my timing marks on my old IP.

attachment.php



I should check mine again. It's not "hard" starting but once started it coughs a tad and stumbles for a few seconds with some smoke before catching on all 8. This is just an overnight start. All other times it fires right up. Sound like a typical DB2 equipped truck in winter weather?
 

Attachments

  • timing marks 2.JPG
    timing marks 2.JPG
    81.6 KB · Views: 174
^^^^^^^^^^Looks like how mine is set.

Mine is LOUD when cold, it rattles off the houses, I piss myself laughing, ):h
 
The one variable you guys aren't talking about is chain stretch. A notch past on the housing might be alot more on a fresh chain than it would be on an old chain.
 
turbovanman said:
^^^^^^^^^^Looks like how mine is set.

Mine is LOUD when cold, it rattles off the houses, I piss myself laughing, ):h
Click to expand...

I know the feeling. Then add the fact that I keep forgetting to put the downpipe back on :D:D:D

Its amazing how loud the 6.5 is with the ATT and nothing after it but and elbow aiming down. Amazingly enough, the ATT does have quite a whistle to it :D:D
 
ak diesel driver said:
The one variable you guys aren't talking about is chain stretch. A notch past on the housing might be alot more on a fresh chain than it would be on an old chain.
Click to expand...

The GM Goodwrench crates came with a new timing chain right? :confused: If not then the chain probably has 100,000 miles on it or so.
 
The sounds you are describing are normally for a 6.2 Mine sounds the same. The 6.2s are a little harder starting smoky compared to a 6.5TD .Totally different fuel system, Aspiration etc. 6.2s generally start better after electric LP conversion. Mine certainly does.
 
Acesneights1 said:
The sounds you are describing are normally for a 6.2 Mine sounds the same. The 6.2s are a little harder starting smoky compared to a 6.5TD .Totally different fuel system, Aspiration etc. 6.2s generally start better after electric LP conversion. Mine certainly does.
Click to expand...

Ditto on the electric LP. Starts much better.
 
The other variable in the timing of things is a worn advance piston. If the truck starts alright but seems to lack power at higher rpm, someone might advance the pump timing to make up for the advance that is no longer being done by the piston. Advancing the pump timing would cure the loss of power higher in revs but also make it sound more clattery down low where a normal amount of advance would be more desirable.
 
A way to check if timing is too far advanced is to push in on the adance lever when the engine is up to running temp. If the engine slows and stumbles it's set properly. If the engine just slows then it's advanced too far. If you get no change then your advance isn't working and neither will the test.
 
s-mack said:
A way to check if timing is too far advanced is to push in on the adance lever when the engine is up to running temp. If the engine slows and stumbles it's set properly. If the engine just slows then it's advanced too far. If you get no change then your advance isn't working and neither will the test.
Click to expand...

Good info.
 
randomid25 said:
The other variable in the timing of things is a worn advance piston. If the truck starts alright but seems to lack power at higher rpm, someone might advance the pump timing to make up for the advance that is no longer being done by the piston. Advancing the pump timing would cure the loss of power higher in revs but also make it sound more clattery down low where a normal amount of advance would be more desirable.
Click to expand...

6.2s lack power period, how can you tell the difference ??):h):h):h:D
 
You must log in or register to reply here.
Back
Top