Timing by flywheel mark?, How do I time engine by flywheel mark? |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
Timing by flywheel mark?, How do I time engine by flywheel mark? |
pistonboy |
Jan 30 2020, 11:33 PM
Post
#1
|
Newbie Group: Members Posts: 38 Joined: 26-October 15 From: California Member No.: 19,305 Region Association: None |
Hello
I have put a Pertronix module in my distributor. I cannot see the timing marks on the blower cage. Isn't there suppose to be a TDC mark on the flywheel I can use? Also, I have carbs on the engine, if that makes a difference. Thank you. |
BeatNavy |
Jan 31 2020, 05:13 AM
Post
#2
|
Certified Professional Scapegoat Group: Members Posts: 2,924 Joined: 26-February 14 From: Easton, MD Member No.: 17,042 Region Association: MidAtlantic Region |
Right in the middle and just behind the engine tin at the back of the engine there is an inspection hole. If you look down through that you will be able to see a notch on the flywheel (if the engine is at TDC). It lines up with the split in the engine case. You probably have to push back the rubber.
Some people find that easier to use. i do not. I'd use it to set your engine at TDC and then find a way to paint a mark on the fan that you an see. |
GregAmy |
Jan 31 2020, 05:53 AM
Post
#3
|
Advanced Member Group: Members Posts: 2,301 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States |
I have kept these links handy:
https://www.pelicanparts.com/techarticles/9.../914_timing.htm http://www.914world.com/bbs2/index.php?showtopic=339759 I've also clearly marked TDC on both the pulley and flywheel last time it was out. I use an adjustable timing light referencing those. |
iankarr |
Jan 31 2020, 07:45 AM
Post
#4
|
The wrencher formerly known as Cuddy_K Group: Members Posts: 2,473 Joined: 22-May 15 From: Heber City, UT Member No.: 18,749 Region Association: Intermountain Region |
Remember that the flywheel/crank makes two revolutions to complete one full rotation of the cam shaft which moves the valves. So, the notch on the flywheel will line up with the split on the case when at TDC for #1 AND #3. Pull the distributor cap and make sure the rotor is pointing to the notch / #1 plug terminal to confirm you're at #1 (from a tiiming standpoint).
|
VaccaRabite |
Jan 31 2020, 07:54 AM
Post
#5
|
En Garde! Group: Admin Posts: 13,444 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
There is a mark on the flywheel that is not easy to use. I would not bother with it.
Pull the inspection plug on the fan shroud. Big black round thing directly in the middle of the top of the fan shroud and directly above the fan. You timing marks will differ as to what engine you have. But if you are using a digital advance variable timing light you will want to use the TDC timing mark, not the red line. The TDC mark is sometimes an uncolored line, sometimes a stamped "0". If you are using an analog light, use the red line (27 degree mark). And of course don't discount a prior owner painting all sorts of different things on the fan that will confuse the hell out of you but made sense to him. Its easiest to use a mirror (I used an inspection mirror on a pole from the auto parts store) to bounce the timing light into the hole and see the result. that way I can work the throttle with one hand, and work the timing light and mirror with the other. As you look down the timing hole in the shroud, there are usually 2 notches. One on the "engine" side of the shroud that is slightly harder to see, and one on the "Firewall" side of the shroud that is easier to see. in my car the one that was easier to see was also slightly off, so I use the mark on the engine side that is harder to see. Since I use a mirror, it really makes no difference. But if you are trying to lean over the car and see it without a mirror you will assume that VW hates us and wants us to feel pain. Just remember that these engines were supposed to go into Buses and rear engined cars, making the timing hole and the engine side notch very easy to use. Zach |
IronHillRestorations |
Jan 31 2020, 03:09 PM
Post
#6
|
I. I. R. C. Group: Members Posts: 6,719 Joined: 18-March 03 From: West TN Member No.: 439 Region Association: None |
Another thing you can do is to rotate the engine by hand to the timing mark and make your own timing mark the back side of the flywheel through the hole in the "bell housing" part of the crankcase on the right side of the car. It's a little harder to get to on an injected engine.
|
pistonboy |
Feb 3 2020, 04:58 AM
Post
#7
|
Newbie Group: Members Posts: 38 Joined: 26-October 15 From: California Member No.: 19,305 Region Association: None |
Thanks guys. You are a great help.
|
Lo-Fi Version | Time is now: 16th May 2024 - 07:35 PM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |