|
|
|
|
| Author |
|
|
Registered
Join Date: Oct 2006
Location: Raleigh, NC
Posts: 760
|
Engine Froze on start up. Ideas??
After putting 1000 miles on my freshly rebuilt 930 engine, I pulled it out for clutch work, fuel mods, and valve adjustment. Everything worked fine when I pulled it. It took me about 6 months to get everything done, and back in the car.
Because it had been sitting, I primed the engine to build oil pressure. I followed everything in Wayne's book, and it turned over fine and built oil pressure. I did a final inspection, and everything looked good. I hooked fuel and spark back up, and proceeded to start the car. As it tried to start, I heard a metal on metal sound, and the engine froze. The starter could no longer turn the engine. I tried to turn over by hand, but it wouldn't budge. I know your not supposed to turn the engine the opposite way, but I tried it just to see if the crank was frozen, and it turned nice and smooth. I then turned it the correct way, and was smooth until it hit a certain point then froze. I drained the oil, and it is clean. I also pulled all the valve covers, and the cams were still turning. I tried to go through the firing order this evening to see what cylinder it is, but now the engine is completely frozen (both directions). I am thinking I dropped a valve, but the engine only had 1k on the clock, with very easy driving. Also if it was a valve wouldn't it occur when the engine is under load? The heads were completely rebuilt by EBS Racing. Any ideas what could be going on other than valves? I am trying to rule everything thing out, before I have to pull the engine again... Thank you for your help in advance!
__________________
John A. 1979 Porsche 930: 3.4L, SC cams, Twin plug, Leask WUR, Custom SSI turbo exhaust, Tial WG, K27HFS, and we can't forget the Zork (short lived depending on my homeowners assoc.) 05 Boxster S: For the Track. 06 Dodge Ram 2500 Power Wagon: Tow Vehicle |
||
07-31-2008, 12:13 AM
|
|
|
Registered
Join Date: Dec 2003
Location: Centreville, MARYLAND
Posts: 938
|
What happens when you pull all the plugs?
__________________
Old Tee all 911s sold |
||
|
07-31-2008, 03:23 AM
|
|
|
Registered
Join Date: Dec 2003
Location: MS.
Posts: 2,322
|
It sounds that a bore-scope could be very helpful in the days to come. Hope you find the problem. Good luck!! Tony.
__________________
84' Steelslantnose Cab. 1953 Dodge B-4-B-108" 90,127 miles 1953 Dodge B-4-C-116" 58,146 miles 1954 Dodge C-1-B8-108" 241V8 POLY 1973 Roadrunner 440-SIX-PACK* 1986 F-250 Super Cab-460 V8 tow Newest additions- Matching numbers 1973 340 Road Runner!! 1948 Dodge B-1-F-152" 1-1/2 ton Dump body, 39,690 miles others... |
||
|
07-31-2008, 08:31 AM
|
|
|
Registered
Join Date: May 2003
Posts: 3,346
|
Since you did clutch work I'd start there. Maybe some bolts were too long or some kind of pressure plate or throw out bearing interference.
-Andy
__________________
72 Carrera RS replica, Spec 911 racer |
||
|
07-31-2008, 10:16 AM
|
|
|
Registered
Join Date: Oct 2006
Location: Raleigh, NC
Posts: 760
|
I pulled all the plugs, it rotated easier, but still hit something.
I was thinking a bore scope as well. I doubt it is the clutch, I did check it, and it does not seem to be the problem. b/c it turned over fine when I was building oil pressure, something must have broke...
__________________
John A. 1979 Porsche 930: 3.4L, SC cams, Twin plug, Leask WUR, Custom SSI turbo exhaust, Tial WG, K27HFS, and we can't forget the Zork (short lived depending on my homeowners assoc.) 05 Boxster S: For the Track. 06 Dodge Ram 2500 Power Wagon: Tow Vehicle |
||
|
07-31-2008, 12:42 PM
|
|
|
Registered
Join Date: Dec 2003
Location: Centreville, MARYLAND
Posts: 938
|
Betcha you lost a valve seat. Back rotate the engine until it stops. Then use a screwdriver and carefully (don't let it bind) Check each piston for upward movement. If all move then use a compression tester on each cylinder and then prepare to pull the cylinder that shows "0". But you might pull all valve covers first and examine the rockers. A bore scope would be better. Good luck.
__________________
Old Tee all 911s sold |
||
|
07-31-2008, 02:08 PM
|
|
|
