Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Forums > 1- Porsche Technical Forums > 911 Engine Rebuilding Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
Join Date: Aug 2002
Location: pac NW
Posts: 48
Red face rebuilt engine seized at startup

First startup on my new 2.7l rebuild. Crank, fires, runs for a second or so. Crank again, huge backfire. Now won't crank. Putting a wrench on the crank pulley, I find I can't move the crank in either direction. Maybe it can move a 1/16 in or so before hitting something solid.

It stopped coming up on compression on #1, so I thought maybe a stuck fuel injector had hydro locked the cylinder with fuel. Pulled the spark plug, no luck.

I removed the starter in case it was stuck. Releasing the clutch doesn't free the crank. so its not in the starter or tranny. I pulled the upper valve covers and the cam positions look sane. I mean, they could be off a tooth and I couldn't tell, but approximately the right cylinders have their intake valves coming up.

Hmmm.

I used the pressure fed tensioners in the rebuild, and carefully bled them as in Wayne's book, so that they were nice and firm before they went in the engine.

What are good next steps to diagnose this? I'm thinking drain the oil and pull the lower valve covers to look for broken rockers, then slack all the valve adjusters and see if that frees the crank. Yuk, hell of a way to start out.
__________________
steve soar
'76 911S in process of being
resurrected
Old 12-05-2004, 12:35 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Registered User
 
BURN-BROS's Avatar
 
Join Date: Jun 2003
Location: Camarillo, Ca.
Posts: 2,235
Did you pull all spark plugs?
__________________
Aaron. F.S. 1965 Solex engine w carbs/cleaner
Burnham Performance
1071 Avenida Acaso suite D Camarillo, Ca.
805-240-6931
http://www.burnhamperformance.com
Old 12-05-2004, 01:08 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Author of "101 Projects"
 
Wayne 962's Avatar
Okay. It may be something minor, so let's walk through the process.

- Pull the plugs
- Pull the upper and lower valve covers
- Loosen up all of the upper and lower rockers (this may help prevent further damage).
- Don't use the starter again
- Pull the distributor

Only being able to move 1/16th in either directly is a bit odd. Usually, you can turn it back if you've hit something. Perhaps there's a nut or something in there causing some interference?

Pull the plugs and try to turn the engine over and let us know what happens...

-Wayne
__________________
Wayne R. Dempsey, Founder, Pelican Parts Inc., and Author of:
101 Projects for Your BMW 3-Series 101 Projects for Your Porsche 911 How to Rebuild & Modify Porsche 911 Engines 101 Projects for Your Porsche Boxster & Cayman 101 Projects for Your Porsche 996 / 997
Coming Soon:
SPEED READ: Porsche 911 (October 2018)
Old 12-05-2004, 01:20 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Registered User
 
adomakin's Avatar
 
Join Date: Mar 2002
Location: Essex UK
Posts: 2,194
Garage
christ. My thoughts are with you at this uncertain time.

Andy
__________________
Andy

1980 SC soon to be big hp 3.3t powered 73RSR Replica (well, I'm keeping the engine but everything else is going )
Old 12-07-2004, 11:34 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Registered User
 
jluetjen's Avatar
 
Join Date: Oct 2001
Location: Westford, MA USA
Posts: 8,594
Garage
BTW, did you spin the motor over on the starter without the plugs in until you saw oil pressure before you tried to start it?
__________________
John
'69 911E

"It's a poor craftsman who blames their tools" -- Unknown
"Any suspension -- no matter how poorly designed -- can be made to work reasonably well if you just stop it from moving." -- Colin Chapman
Old 12-07-2004, 12:46 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Registered User
 
john walker's workshop's Avatar
 
Join Date: Mar 2001
Location: seattle wa usa 206.789.6800
Posts: 17,265
did the case get align bored? could you turn the crank easily by hand after torquing up the case studs/nuts?
__________________
jwworkshop@aol.com 206 789 6800
7613 greenwood ave n seattle wa 98103
Old 12-07-2004, 12:58 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
 
Registered User
 
Join Date: Jan 2004
Location: Charleston, SC
Posts: 819
I really wanted to hear the outcome of this one. Hope it turned into something simple.
__________________
Kevin
'79 Coupe
Old 12-12-2004, 09:57 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #8 (permalink)
Registered User
 
Ho Hum 74's Avatar
 
Join Date: Jul 2003
Location: Northbrook, IL
Posts: 1,165
Garage
The good question already posed is: did you crank it over many times to build oil pressure before putting the plugs in etc?

If you did then what I'm about to say doesn't apply.

I had a situation where one of the pressure plate bolts was too long and was hanging up on the case. It must have been a fastener that got in the mix somehow. It prevented me for turning over the engine.

Tristan
Old 12-16-2004, 10:04 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #9 (permalink)
Registered User
 
smestas's Avatar
 
Join Date: Jul 2002
Location: Santa Clarita, CA
Posts: 871
Garage
Send a message via AIM to smestas Send a message via Yahoo to smestas
I just sent Steve a email. Perhaps he has his posting notifications turned off. Im dying to know what happen.
__________________
Simon Mestas
'78SC Coupe
My Pelican Page | AlfaBB - Alfa Romeo Forum
Old 12-16-2004, 10:11 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #10 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 04:24 PM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.