SR crank timing -short cut?- - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

05civse · 05-27-2006, 10:01 PM

Okay, I did a full head job on my S13 SR blacktop. I got it back together and lined up the cam timing marks on the timing chain only to find that the chain must have jumped few teeth on the crank sprocket

. I didn't want to take off the lower and upper oil pans and front cover to check the timing mark on the crank. Is there an easy way to get the timing correct at the crank than to tear off the oil pans? Thanks guys

*fliprayzin240sx* · 05-28-2006, 01:46 PM

http://www.rs-enthalpy.com/

Look under engine build up and there should be an explanation:

SR20DET Camshaft Installation Procedure

1. Set crank to top dead center (TDC)…2nd mark from the left on the pulley. With the #1 cam lobes facing away from each other.
2. Remove tensioner.
3. Look at the front of the exhaust cam. You will see that there is a pin that locks the cam to the gear. You will also see a dot stamped into the cam gear at approximately 1 O’clock. This dot is used to mark tooth #1.
4. Starting from exhaust cam tooth #1 count (clockwise) the number of teeth until the top surface of the head. The head should be between 8 and 9 teeth.
5. Adjust cam position as necessary.
6. Find the DOT on intake cam. Once again this is tooth #1. Count COUNTER-clockwise to the top of the head. You should find that the top of the head should be between 4½ and 5½ teeth. Adjust as necessary.
7. Count the number of chain pins between the 2 dots across the top. You should count 20 pins.
8. Install tensioner. Rotate engine 2 full turns and slowly bring it back to TDC ( #1 lobes out)
9. Re-inspect cam position as listed above. Repeat if necessary.
10. Install CAS according to FSM procedure.

05civse · 05-28-2006, 02:17 PM

awsome, I thought it out and made my guess and it turns out that I was correct! thanks for the info.

05-28-2006, 01:46 PM	#2
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	http://www.rs-enthalpy.com/ Look under engine build up and there should be an explanation: SR20DET Camshaft Installation Procedure 1. Set crank to top dead center (TDC)…2nd mark from the left on the pulley. With the #1 cam lobes facing away from each other. 2. Remove tensioner. 3. Look at the front of the exhaust cam. You will see that there is a pin that locks the cam to the gear. You will also see a dot stamped into the cam gear at approximately 1 O’clock. This dot is used to mark tooth #1. 4. Starting from exhaust cam tooth #1 count (clockwise) the number of teeth until the top surface of the head. The head should be between 8 and 9 teeth. 5. Adjust cam position as necessary. 6. Find the DOT on intake cam. Once again this is tooth #1. Count COUNTER-clockwise to the top of the head. You should find that the top of the head should be between 4½ and 5½ teeth. Adjust as necessary. 7. Count the number of chain pins between the 2 dots across the top. You should count 20 pins. 8. Install tensioner. Rotate engine 2 full turns and slowly bring it back to TDC ( #1 lobes out) 9. Re-inspect cam position as listed above. Repeat if necessary. 10. Install CAS according to FSM procedure. __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

05-27-2006, 10:01 PM	#1
05civse Leaky Injector Join Date: Jul 2005 Location: out and about Posts: 125 Trader Rating: (0) Feedback Score: 0 reviews	SR crank timing -short cut?- Okay, I did a full head job on my S13 SR blacktop. I got it back together and lined up the cam timing marks on the timing chain only to find that the chain must have jumped few teeth on the crank sprocket . I didn't want to take off the lower and upper oil pans and front cover to check the timing mark on the crank. Is there an easy way to get the timing correct at the crank than to tear off the oil pans? Thanks guys

05-28-2006, 02:17 PM	#3
05civse Leaky Injector Join Date: Jul 2005 Location: out and about Posts: 125 Trader Rating: (0) Feedback Score: 0 reviews	awsome, I thought it out and made my guess and it turns out that I was correct! thanks for the info.