| Author |
Message |
82 308gtsi (Gary_t)
New member
Username: Gary_t
Post Number: 6
Registered: 1-2003
| | Posted on Tuesday, January 07, 2003 - 1:15 am: | |
I am taking Mitchell suggestion starting from scratch. Didn't know I need to crank 90 degrees CW to bring piston #5 to TDC. I'll post the outcome. Thank you all for the crucial information. |
Steve Magnusson (91tr)
Intermediate Member
Username: 91tr
Post Number: 1290
Registered: 1-2001
| | Posted on Monday, January 06, 2003 - 9:54 am: | |
Gary -- Did you or did you not have the dist-to-cam spline connections apart when you did the valve clearance work? If not, I'd (unfortunately) conclude that the cams are not in their original positions relative to the crankshaft (since the dist rotor -to- cam relationship should be unchanged). I don't understand your comment "timing belt pulley's marking" as there are no factory reference marks on the pulley itself. Bottom line is that with the #1 piston at TDC AND the camshaft marks all aligned to the marks on the frontmost cam caps (i.e., piston #1 at TDC and at the end of its compression stroke), the 1-4 dist rotor should be pointing to the #1 contact inside the cap (or a bit "after" to allow for the advance at higher RPM). If you then rotate the crankshaft 90 deg CW (as viewed at the timing belt end) to bring piston #5 to TDC (and at the end of it's compression stroke), the 5-8 dist rotor should be pointing to the #5 contact inside the other dist cap. There is a small notch in the top rim of each distributor housings (Fig 7 page L14 of the WSM) to aid with the dist rotor alignment to the internal contact. |
Mitchell Le (Yelcab1)
Member
Username: Yelcab1
Post Number: 486
Registered: 11-2001
| | Posted on Monday, January 06, 2003 - 9:48 am: | |
If you suspect that your timing is totally off, I would suggest that you start from scratch.
1. Remove the distributors.
2. Line up the crank to #1 TDC.
3. Make sure the camshafts (all four cams) are lined up with the cam marking. You will have to remove the valve covers to check the allignment.
4. With the distributors out of the car, fit the distributor caps on top of the distributors and use a piece of tape (or equivalent) to mark the position of the Number 1 firing position on the 1-4 dizzy, and number 5 firing position on the 5-8 dizzy.
5. Then, install the 1-4 dizzy with the rotor pointing to the number 1 firing position. use the previous mark as a guide.
6. Turn the crank 90 degrees to the Number 5 TDC position.
7. install the 5-8 dizzy with the rotor pointing to the number 5 firing position.
Now, you should have it roughly correct for the timing. Your car has the fuel injection system, so, I believe that is all you need to do to get it running. It is possible afterward to slightly adjust the timing with a timing light once the car is running.
This is a lot of work. Do this only if you think your timing is totally, and way off. Otherwise, it should only be a tweak to get it firing. |
JRV (Jrvall)
Member
Username: Jrvall
Post Number: 520
Registered: 11-2002
| | Posted on Monday, January 06, 2003 - 9:30 am: | |
check the cap mounting plates, sounds like you have them on wrong. |
Gerrit Visser (Gerritv)
Junior Member
Username: Gerritv
Post Number: 136
Registered: 6-2001
| | Posted on Monday, January 06, 2003 - 6:30 am: | |
Hi
The GT4 WSM (and probably for the GTSi as well) shows how this is aligned. Check http://ferrari.jenkins.org for a copy. |
82 308gtsi (Gary_t)
New member
Username: Gary_t
Post Number: 4
Registered: 1-2003
| | Posted on Monday, January 06, 2003 - 2:07 am: | |
my ignition timing is totally off. I don't know exactly what I did to cause this problem. Can anyone tell me what is the phasing of dist/rotor when #1 cylinder piston is at its TDC (top dead center) and the marking on cam shaft is aligned with timing belt pulley's marking? Currently, my rotor is situated with ignition-end pointed at about 10 o'clock which is not #1 cylinder firing position. When I start the engine, It will backfire 1-2 time initially then any further cranking only showered spark plugs with fuel. I confirmed there is spark when cranking by pulled the spark plug out with cable attached. This tell me timing of firing is off. In order to correct this problem, I need to know what is the correct phasing of dist/rotor. Once I have that information then I can move to the next step which lead to the next question. How to correct the timing? Can some one out there give me some help!!!!!! This is killing me. For 2 month, everybody I know is asking me the same question "where's your Ferrari?" thanks Steve from my previous post "unable to start my 308 at all" |