Crank / Timing belt issues - Subaru Enthusiasts Car Club of the Sierras

coronan · 2007-05-16, 04:39 PM

So I just did a valve job on my 99 legacy OB. Got it all together, turned it over and came up with P0336. No problem belt must be a tooth off. I got it all apart, started lining everything up but my crank shaft locks up. It will turn 3/4 of a turn either direction but will not come back to #1 TDC.

Ive tried various valve positions but it stops hard either direction in the same location. Listening to the motor with a scope i cant hear anything loose inside there.

What did i do?

nate

Dean · 2007-05-16, 04:50 PM

My guess is you were 360 crank or 180 cam degrees out of sync on at least one cam. You probably bent something. Sorry, but you are likely going to need to tear it down again.

Always turn a rebuilt over by hand the first 720 degrees. Even that won't save you all the time. My dad did the same thing with his Lotus.

coronan · 2007-05-17, 06:41 AM

Maybe im still in denial. When i cranked it for a bout 20 sec it sounded fine. When i pulled the timing covers off and rotated it by hand 1: it turned fine. 2. the cams were good. the crank was 2 tooth off.

I guess the only way to find out is visual inspection.

AtomicLabMonkey · 2007-05-17, 07:58 AM

If you can't rotate the crank by hand something is definitely wrong. I would guess your hard stop means 2 parts are contacting at that point internally.

GST Mike · 2007-05-17, 08:35 AM

Sounds like interference to me I am sorry to say.

Mike

MPREZIV · 2007-05-17, 11:23 AM

Sum Ting Wong... for sure. ^^what those two said. It should turn. If not, something's stopping it. =NOT GOOD

coronan · 2007-05-19, 03:58 AM

So i found 1 bent and 1 completely broken exhaust valve.
Can anyone recomed a fast shop? Last time i used Indepedant, good guys but thier machine shop had my heads for over a week.

Is anyone running ported heads? What kind of HP gain? Who did the work? How much?

sybir · 2007-05-19, 06:02 AM

I'm not from Reno so can't recommend a shop, but breathing mods don't do much on the 2.5's. I had mine done(port and polish) and the difference was negligible, even on the butt dyno. I got much better results with headers and a header-back exhaust on my 97.

coronan · 2007-05-19, 05:30 PM

Whats the magic bullet for compressing valve springs?

Im trying to do as much as i can my self to make this a less expensive mistake.

coronan · 2007-05-19, 10:49 PM

Just kidding. I got creative and figured it out.

Does ayone know the tollerance for pucking the lifters?

2007-05-16, 04:50 PM	#2
Dean Señor Cheap Bastarde Real Name: Dean Join Date: May 2003 Location: $99 Tire Store Posts: 9,294 Car: $.04 STI Class: Fast,Cheap & Reliable=STI Deal, did somebody say Deal? Oh, Dean, yeah that's me.	My guess is you were 360 crank or 180 cam degrees out of sync on at least one cam. You probably bent something. Sorry, but you are likely going to need to tear it down again. Always turn a rebuilt over by hand the first 720 degrees. Even that won't save you all the time. My dad did the same thing with his Lotus. __________________ I am a Commodore PET --- Now get off my lawn you kids...

2007-05-17, 07:58 AM	#4
AtomicLabMonkey Nightwalker Real Name: Austin Join Date: Dec 2002 Location: Oshkosh, WI Posts: 4,063 Car: '13 WRX YGBSM	If you can't rotate the crank by hand something is definitely wrong. I would guess your hard stop means 2 parts are contacting at that point internally. __________________ "None of you seem to understand. I'm not locked in here with you.. you're locked in here with me."

2007-05-17, 11:23 AM	#6
MPREZIV Token Real Name: Le Stig Afrique? Join Date: Jun 2005 Location: sitting next to a big yellow box Posts: 3,589 Car: 2001 Impreza 2.5 RS Class: 05 TDSP No, I won't work on your car. F your car*	Sum Ting Wong... for sure. ^^what those two said. It should turn. If not, something's stopping it. =NOT GOOD __________________ "...these condoms have a topical anesthetic to reduce sensitivity, so you can last longer. What a paradox. You can't feel a thing, but you can f*ck for HOURS..."

2007-05-19, 06:02 AM	#8
sybir The Don Real Name: Aaron Join Date: Oct 2003 Location: Sacramento Posts: 3,097 Car: '97 Legacy / '05 FXT Class: low	I'm not from Reno so can't recommend a shop, but breathing mods don't do much on the 2.5's. I had mine done(port and polish) and the difference was negligible, even on the butt dyno. I got much better results with headers and a header-back exhaust on my 97. __________________ Tact is for people who aren't witty enough to be sarcastic.

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2007-05-16, 04:39 PM	#1
coronan n00b Join Date: Nov 2006 Location: Reno Posts: 9 Car: 99 OBW	Crank / Timing belt issues So I just did a valve job on my 99 legacy OB. Got it all together, turned it over and came up with P0336. No problem belt must be a tooth off. I got it all apart, started lining everything up but my crank shaft locks up. It will turn 3/4 of a turn either direction but will not come back to #1 TDC. Ive tried various valve positions but it stops hard either direction in the same location. Listening to the motor with a scope i cant hear anything loose inside there. What did i do? nate

2007-05-17, 06:41 AM	#3
coronan n00b Join Date: Nov 2006 Location: Reno Posts: 9 Car: 99 OBW	Maybe im still in denial. When i cranked it for a bout 20 sec it sounded fine. When i pulled the timing covers off and rotated it by hand 1: it turned fine. 2. the cams were good. the crank was 2 tooth off. I guess the only way to find out is visual inspection.

2007-05-17, 08:35 AM	#5
GST Mike EJ22 Join Date: Apr 2005 Location: Hayward, CA Posts: 191 Car: Zee L Load, Efficiency, MAP etc etc etc	Sounds like interference to me I am sorry to say. Mike

2007-05-19, 03:58 AM	#7
coronan n00b Join Date: Nov 2006 Location: Reno Posts: 9 Car: 99 OBW	So i found 1 bent and 1 completely broken exhaust valve. Can anyone recomed a fast shop? Last time i used Indepedant, good guys but thier machine shop had my heads for over a week. Is anyone running ported heads? What kind of HP gain? Who did the work? How much?

2007-05-19, 05:30 PM	#9
coronan n00b Join Date: Nov 2006 Location: Reno Posts: 9 Car: 99 OBW	Whats the magic bullet for compressing valve springs? Im trying to do as much as i can my self to make this a less expensive mistake.

2007-05-19, 10:49 PM	#10
coronan n00b Join Date: Nov 2006 Location: Reno Posts: 9 Car: 99 OBW	Just kidding. I got creative and figured it out. Does ayone know the tollerance for pucking the lifters?