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Username Post: Timing a 1985 305        (Topic#138269)
Jugg3rnaut 
Member
Posts: 7

Loc: Mannheim, Germany
Reg: 03-29-05
08-16-06 09:09 AM - Post#986422    

I'm looking for information on timing my 85 Blazer's 305. I'm in Germany so using a computer is out. How can I add timing marks to the harmonic balancer without dismantling the engine?

 
Slonaker 
Senior Member
Posts: 720
Slonaker
Loc: San Antonio, TX
Reg: 11-26-01
Re: Timing a 1985 305
08-16-06 03:32 PM - Post#986423    
    In response to Jugg3rnaut

You don't need a computer, just a timing light. There is a notch in the harmonic balancer that will line up with the timing tab on the timing chain cover. I think you look straight down behind the water pump on the 305 to see the marks on the tab.

It helps to clean up the balancer and the tab and make a white mark on the notch to make it stand out. I usually use chalk or liquid paper.

Slonaker
'86 Chevy C10 Silverado See it here or here.


 
N8sToolz 
Very Senior Member
Posts: 2315
N8sToolz
Age: 28
Loc: N 42┬░ 53.290' W71┬░ 34.1...
Reg: 10-23-03
Re: Timing a 1985 305
08-20-06 07:39 AM - Post#986424    
    In response to Slonaker

if you cant find any timing marks, advance the timing until it pings, then back it off a bit, drive and adjust as necessary. Thats how i have to do it since my timing tab is MIA.
1982 Chevy K20 Converted from C20.
355/700R4
2002 Yamaha XVS1100CL VStar
2002 S10 2WD


 
Vaughn 
"12th Year" Gold Supporting Member
Posts: 14693

Loc: Colorado Springs, CO
Reg: 08-08-04
Re: Timing a 1985 305
08-20-06 08:41 AM - Post#986425    
    In response to N8sToolz

There WILL be a timing mark on the damper (ALL, ALL, ALL stock or modified SBC dampers have them). If the motor has been apart, the reference mark on the timing cover COULD have been removed, but it usually isn't likely.

It may not be in a place where you expect it. Look on both the drivers side and passenger side for a reference timing mark (sometimes they are a little round piece of steel like a bullseye sight). It may be a little buried a little bit under pulleys and belts.

When you change the timing - if it has ESC or a fuel injection system - you need to unplug the timing reference sensor on the distributor that goes to the CPU. Otherwise the computer will just back out the timing changes you just made. Once you have made your timing changes, then plug the timing sensor wire back in.

 
Jugg3rnaut 
Member
Posts: 7

Loc: Mannheim, Germany
Reg: 03-29-05
Re: Timing a 1985 305
08-25-06 12:16 PM - Post#986426    
    In response to Jugg3rnaut

I should have been more specific. There are no timing marks on the balancer, nor timing tab anywhere on my engine. There is a tube attached to the timing cover, right behind the water pump. Its for a magnetic sensor on a SUN Machine to be placed. I would so much like to convert to timing light marks, but how?

 
N8sToolz 
Very Senior Member
Posts: 2315
N8sToolz
Age: 28
Loc: N 42┬░ 53.290' W71┬░ 34.1...
Reg: 10-23-03
Re: Timing a 1985 305
08-26-06 03:48 AM - Post#986427    
    In response to Jugg3rnaut

Then you will have to change the cover and the balancer. Ther will have markings as they are all the same standard.
1982 Chevy K20 Converted from C20.
355/700R4
2002 Yamaha XVS1100CL VStar
2002 S10 2WD


 
Slonaker 
Senior Member
Posts: 720
Slonaker
Loc: San Antonio, TX
Reg: 11-26-01
Re: Timing a 1985 305
08-26-06 09:42 AM - Post#986428    
    In response to Jugg3rnaut

On my 305 the timing marks were there with that tube. I would be willing to bet that you will find the mark on the balancer if you clean it up. It is just a little dent or notch in the edge. It look s like someone bumped it with a file.

Slonaker
'86 Chevy C10 Silverado See it here or here.


 
GreyScar 
Member
Posts: 39

Loc: South Cackalackie
Reg: 08-27-06
Re: Timing a 1985 305
08-31-06 11:29 AM - Post#986429    
    In response to Jugg3rnaut

I didn't think fuel injection started till 87, Get no.1 cyl. at TDC on compression, Get a flash light or something and check the 1 o'clock position on the dampner, there should be something there, That tube behind the water pump and mounted on the timing change cover is a bullseye as stated in the 1000 or so I've seen, Might be something different across the water.......

 
gchemist 
Senior Chevytalk Moderator
Posts: 21635
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
Re: Timing a 1985 305
09-03-06 06:26 PM - Post#986430    
    In response to Jugg3rnaut

Welcome to the site.
Read all the articles under the Ignition section here.
BTW - I run my 305 at 4 degrees. Do you have a vacuum guage? I tune my truck at idle this way.
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS


 
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