Crank/cam alignment |
|
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. |
|
Crank/cam alignment |
Shindog1961 |
Feb 16 2014, 11:51 PM
Post
#1
|
Member Group: Members Posts: 196 Joined: 10-November 12 From: Santa Fe New Mexico Member No.: 15,133 Region Association: Southwest Region |
So putting an engine back together all the books say aligning the cam and crank gears just line up the 2 dots on the crank and put the 1 dot on the cam between them. Is mine the only crank gear with no markings? The 1 dot is there on the cam gear, but nothing on the crank. How can you align the gears? Can it be done accurately? Any help would be great.
|
colingreene |
Feb 17 2014, 04:53 AM
Post
#2
|
Senior Member Group: Members Posts: 729 Joined: 17-October 13 From: Southern California Member No.: 16,526 Region Association: Southern California |
Weird question but is it possible that the crank gear is on backwards?
but if its got no marks on it id just buy new gears. |
stugray |
Feb 17 2014, 10:39 AM
Post
#3
|
Advanced Member Group: Members Posts: 3,825 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
The dot on the crank gear is indexed from the keyway.
I have pics at home. If you can get a pic of a gear with the dot that shows the keyway, you can just count teeth. But my first thought was also that you might have the gear on backwards. |
bdstone914 |
Feb 17 2014, 11:06 AM
Post
#4
|
bdstone914 Group: Members Posts: 4,534 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
The dot on the crank gear is indexed from the keyway. I have pics at home. If you can get a pic of a gear with the dot that shows the keyway, you can just count teeth. But my first thought was also that you might have the gear on backwards. Unless you are running straight cut gears the teeth would not align if the crank gear were on backwards. |
Shindog1961 |
Feb 17 2014, 12:32 PM
Post
#5
|
Member Group: Members Posts: 196 Joined: 10-November 12 From: Santa Fe New Mexico Member No.: 15,133 Region Association: Southwest Region |
No marks on either side. Is there anyway to align the gears without the marks?
|
stugray |
Feb 17 2014, 03:45 PM
Post
#6
|
Advanced Member Group: Members Posts: 3,825 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
Here are some pics of an old toasted crank from a 1.8 motor.
I marked the keyway gear tooth (valley) that lines up with the keyway (@90 deg - 3-oclock) with white paint. I marked the two camshaft alignment dots ( close to 180 degrees from keyway @~275degrees - 9:20oclock) with white soapstone. (IMG:http://www.914world.com/bbs2/uploads_offsite/i366.photobucket.com-10819-1392673555.1.jpg) From these you can see that the dots are to either side of the gear valley that is13 counter-clockwise from the valley at the key. Or 15 clockwise from the valley at the key. In this one you can barely see the keyway below the white marking on the gear. (IMG:http://www.914world.com/bbs2/uploads_offsite/i366.photobucket.com-10819-1392673555.2.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/i366.photobucket.com-10819-1392673555.3.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/i366.photobucket.com-10819-1392673555.4.jpg) HTH QUOTE Unless you are running straight cut gears the teeth would not align if the crank gear were on backwards. I believe that you can flip the gear and the teeth will be aligned the same way. But you might not be able to see the dots any longer. |
Cap'n Krusty |
Feb 17 2014, 05:21 PM
Post
#7
|
Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
IIRC, and I don't have a gear here to look at, there's a relief cut in the inner diameter of the gear to clear the radius on the crank. Putting the gear on backwards should prevent it from fully seating, and that would prevent the snap ring from entering the groove in the crank.
The Cap'n |
Shindog1961 |
Feb 17 2014, 08:03 PM
Post
#8
|
Member Group: Members Posts: 196 Joined: 10-November 12 From: Santa Fe New Mexico Member No.: 15,133 Region Association: Southwest Region |
Thanks the pics are great that will get me going!
Sean |
Dave_Darling |
Feb 17 2014, 11:56 PM
Post
#9
|
914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
If there are no dots, could the gear be the wrong gear? Maybe one from some other application that (mostly) fits? Does it have the right number of teeth?
--DD |
AE354803 |
Feb 18 2014, 07:34 PM
Post
#10
|
Member Group: Members Posts: 232 Joined: 13-August 12 From: Southern California Member No.: 14,801 Region Association: Southern California |
If there are no dots, could the gear be the wrong gear? Maybe one from some other application that (mostly) fits? Does it have the right number of teeth? --DD I had a bad gear on my crankshaft (and a bad crankshaft). I would make sure that it has the right amount of teeth, but for your trouble it might be safer to just replace it. You can do it pretty easily with a 3 jaw puller and a plumbers torch Part# 021 105 209 A (I got mine from Parts Heaven). http://www.914world.com/bbs2/index.php?s=&...t&p=1849695 |
stugray |
Feb 18 2014, 10:33 PM
Post
#11
|
Advanced Member Group: Members Posts: 3,825 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
QUOTE You can do it pretty easily with a 3 jaw puller and a plumbers torch Funny last time I did that I put my 3 jaw puller on it and torqued it to as much as I felt comfortable with (2 grunts & a fart). Then I heated the gear carefully with a torch. Just as I thought it wasnt going to come loose....BAM!!! The puller and gear flew off and up in the air at least 3 feet. I need to get a real press.... |
AE354803 |
Feb 18 2014, 10:37 PM
Post
#12
|
Member Group: Members Posts: 232 Joined: 13-August 12 From: Southern California Member No.: 14,801 Region Association: Southern California |
QUOTE You can do it pretty easily with a 3 jaw puller and a plumbers torch Funny last time I did that I put my 3 jaw puller on it and torqued it to as much as I felt comfortable with (2 grunts & a fart). Then I heated the gear carefully with a torch. Just as I thought it wasnt going to come loose....BAM!!! The puller and gear flew off and up in the air at least 3 feet. I need to get a real press.... Exactly, step back and let the puller do its work, just make sure nothing breakable is nearby. |
Shindog1961 |
Feb 19 2014, 12:43 AM
Post
#13
|
Member Group: Members Posts: 196 Joined: 10-November 12 From: Santa Fe New Mexico Member No.: 15,133 Region Association: Southwest Region |
How many teeth?
|
cwpeden |
Feb 19 2014, 01:28 AM
Post
#14
|
Great White North, huh? Group: Members Posts: 916 Joined: 20-August 06 From: Victoria BC Member No.: 6,693 Region Association: Canada |
|
Lo-Fi Version | Time is now: 6th June 2024 - 02:51 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 ... |