Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
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.
 

Welcome Guest ( Log In | Register )

2 Pages V  1 2 >  
 Reply to this topicStart new topic
> Engine Assembly Problems!
TeamAxisRacing
post Jan 6 2006, 08:35 PM
Post #1


Member
**

Group: Members
Posts: 107
Joined: 13-September 03
From: seattle, Wa
Member No.: 1,153
hello i was wondering if some of you engine builder guru's have some ideas what can be wrong with my 1.7liter W code motor i tryed calling brad roberts and jake raby but both didnt answer (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif)

so heres the dealio.. the case is together. cam is lined up correctly and the crank bearing pins are lined up (far as i can tell i did it 5 times!) everything was going fine and i was starting to torque the case half bolts and checking the rotating assembly. now there is a point in the rotation where it binds (IMG:http://www.914world.com/bbs2/html/emoticons/screwy.gif) flip it back around about 650-700 degrees and it hits the same spot. sitting there with a flash light i couldnt see any of the conrods or counterwights hitting the case or cam. so i undid all the bolts and nuts to see if it was just the case being tweeked but its not.

now there is quite a bit of endplay since i dont have a flywheel on the assembly but i really dont think that will cause this problem with the rotating mass.


so any suggestions? im going back out too the shop to play with it tommarow thanks... (IMG:http://www.914world.com/bbs2/html/emoticons/popcorn[1].gif) (IMG:http://www.914world.com/bbs2/html/emoticons/headbang.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
r_towle
post Jan 6 2006, 08:52 PM
Post #2


Custom Member
***************

Group: Members
Posts: 24,574
Joined: 9-January 03
From: Taxachusetts
Member No.: 124
Region Association: North East States
bearings.

Place your bearings into the case with no crank.

Torque the case together and check to see if they are still round...they wont be...

Or, place them in the case halves and measure the amount that is sticking out of the case half...

You may need to machine a bit off of each end of the bearing...

Or you might want to get new bearings...your choice.

Rich
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Bleyseng
post Jan 6 2006, 09:11 PM
Post #3


Aircooled Baby!
**********

Group: Members
Posts: 13,034
Joined: 27-December 02
From: Seattle, Washington (for now)
Member No.: 24
Region Association: Pacific Northwest
Hammer Time! (IMG:http://www.914world.com/bbs2/html/emoticons/smash.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
sean_v8_914
post Jan 6 2006, 09:31 PM
Post #4


Chingon 601
****

Group: Members
Posts: 4,011
Joined: 1-February 05
From: San Diego
Member No.: 3,541
put the flywheel on with the 3 shims, no o-ring, no rear seal. see if it turns freely with the flywheel in place.
without the flywheel in place, teh crank will move fore and aft causing it to bind slightly.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
dmenche914
post Jan 6 2006, 11:17 PM
Post #5


Senior Member
***

Group: Members
Posts: 1,212
Joined: 27-February 03
From: California
Member No.: 366
Since you state the jamming happens at about every two revolutions (720 degrees) suspect the jam is in the valve train, oil pump, or distributor drive. the cam turns at half the rate of the crank, so two crank revolutions mean one cam revolution hence one valve train cycle. Driven by the cam is the oil pump, same thing, two revs on the crank give one rev on the oil pump.
The dizzy is driven off the crank, but the gear ratio is also two to one, two crank revs to spin the distributor once.

So my bet is cam gear, oil pump, valve train or distributor drive. could be bad part, junk in the way or what ever.

good luck
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
sean_v8_914
post Jan 6 2006, 11:42 PM
Post #6


Chingon 601
****

Group: Members
Posts: 4,011
Joined: 1-February 05
From: San Diego
Member No.: 3,541
dmenche914's logic is good. it is in that area but try it with the flywheel first before you tear it down. if it does not feel 100% RIGHT tear it down and inspect. you should be test fitting everything before final assembly anyway.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Bleyseng
post Jan 6 2006, 11:46 PM
Post #7


Aircooled Baby!
**********

Group: Members
Posts: 13,034
Joined: 27-December 02
From: Seattle, Washington (for now)
Member No.: 24
Region Association: Pacific Northwest
no oil pump or dizzy drive installed yet. We were gonna try the flywheel on it in the morning as I had the same problem IIRC bout two months ago....
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
sean_v8_914
post Jan 7 2006, 12:03 AM
Post #8


Chingon 601
****

Group: Members
Posts: 4,011
Joined: 1-February 05
From: San Diego
Member No.: 3,541
how come all the good engine building parties are so far away
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
KenH
post Jan 7 2006, 12:11 AM
Post #9


Senior Member
***

Group: Members
Posts: 680
Joined: 16-January 03
From: Gilroy, CA
Member No.: 156
If you changed the CAM gear - see if the bolts are hitting the oil pump.

Ken
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Bleyseng
post Jan 7 2006, 10:43 AM
Post #10


Aircooled Baby!
**********

Group: Members
Posts: 13,034
Joined: 27-December 02
From: Seattle, Washington (for now)
Member No.: 24
Region Association: Pacific Northwest
yes, new cam gear but the oil pump isn't in yet! I keep lookin inside to see if the crank cheeks are rubbing the case as its pretty loose for and aft. We'll add the flywheel and see how that goes....

early case with a windage tray but no way toseal it as it doen't have the cast in shelf. (IMG:http://www.914world.com/bbs2/html/emoticons/dry.gif)


Should make a nice 80hp (IMG:http://www.914world.com/bbs2/html/emoticons/drooley.gif)


(IMG:http://www.914world.com/bbs2/html/emoticons/shocked[1].gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
sean_v8_914
post Jan 7 2006, 10:44 AM
Post #11


Chingon 601
****

Group: Members
Posts: 4,011
Joined: 1-February 05
From: San Diego
Member No.: 3,541
(IMG:http://www.914world.com/bbs2/html/emoticons/icon_bump.gif)
what is teh virdict?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
eeyore
post Jan 7 2006, 10:54 AM
Post #12


Senior Member
***

Group: Members
Posts: 889
Joined: 8-January 04
From: meridian, id
Member No.: 1,533
Region Association: None
QUOTE (sean_v8_914 @ Jan 6 2006, 10:03 PM)
how come all the good engine building parties are so far away

You could come over to my house, if'n you really want to. I've started on my 2316 kit.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Bleyseng
post Jan 7 2006, 10:57 AM
Post #13


Aircooled Baby!
**********

Group: Members
Posts: 13,034
Joined: 27-December 02
From: Seattle, Washington (for now)
Member No.: 24
Region Association: Pacific Northwest
QUOTE (sean_v8_914 @ Jan 7 2006, 08:44 AM)
(IMG:http://www.914world.com/bbs2/html/emoticons/icon_bump.gif)
what is teh virdict?

Too early here to drive over to the shop/garage! I'm just drinking my morning coffee

I am sure Blair isn't up yet as he went out last night with the GF......


If you are inviting me down and have a room to stay in San Diego, I'm there!

too much rain up here lately. (IMG:http://www.914world.com/bbs2/html/emoticons/dry.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
TeamAxisRacing
post Jan 7 2006, 03:52 PM
Post #14


Member
**

Group: Members
Posts: 107
Joined: 13-September 03
From: seattle, Wa
Member No.: 1,153
ugh i just got up at 1pmwe;ll see what happens (IMG:http://www.914world.com/bbs2/html/emoticons/slap.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Bleyseng
post Jan 7 2006, 03:53 PM
Post #15


Aircooled Baby!
**********

Group: Members
Posts: 13,034
Joined: 27-December 02
From: Seattle, Washington (for now)
Member No.: 24
Region Association: Pacific Northwest
Bring my tools by!!!!
ohyeah, I have the keys, dude. (IMG:http://www.914world.com/bbs2/html/emoticons/yawn.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Brad Roberts
post Jan 7 2006, 04:08 PM
Post #16


914 Freak!
***************

Group: Members
Posts: 19,148
Joined: 23-December 02
Member No.: 8
Region Association: None
Call me again. I was out at 5am this morning on a exotic car fun run. I'm back at the shop.

Is the oil pump in it? If it is.. one of the bolt heads is hitting the oil pump.


B
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
KenH
post Jan 7 2006, 04:13 PM
Post #17


Senior Member
***

Group: Members
Posts: 680
Joined: 16-January 03
From: Gilroy, CA
Member No.: 156
Hey B - Pick another one - Ken already got that one.

Ken
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Bleyseng
post Jan 7 2006, 04:16 PM
Post #18


Aircooled Baby!
**********

Group: Members
Posts: 13,034
Joined: 27-December 02
From: Seattle, Washington (for now)
Member No.: 24
Region Association: Pacific Northwest
I just saw Blair and he is going out to the shop.
No, the effin oil pump isn't in yet!

He is going to try putting the flywheel on now with some shims to see if that corrects the problem. Maybe the cam gear has a pos stuck on it......
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
TeamAxisRacing
post Jan 7 2006, 08:40 PM
Post #19


Member
**

Group: Members
Posts: 107
Joined: 13-September 03
From: seattle, Wa
Member No.: 1,153
heres a pic of the block..

i took the case apart today after talking to brad on the phone. put it all back together and torqued and it works fine now. i didnt see any problem definitly wierd stuff (IMG:http://www.914world.com/bbs2/html/emoticons/slap.gif)


Attached image(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
TeamAxisRacing
post Jan 7 2006, 08:42 PM
Post #20


Member
**

Group: Members
Posts: 107
Joined: 13-September 03
From: seattle, Wa
Member No.: 1,153
durka durka (IMG:http://www.914world.com/bbs2/html/emoticons/pray.gif)


Attached image(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

2 Pages V  1 2 >
Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 14th May 2024 - 01:07 AM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
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 ...