Need urgent help. Timing chain sprocket. VIDEO..

[2003 mustang gt modded]

Hi, I have 2003 mustang gt and I'm replacing timing chain and sprokets. How do I untighten timing chain sprocket bolt and how do I torque it. Thanks in advance.

 

[RaggedGT]

I’m assuming a mod motor, right? If so-how experienced are you ? Do you have the skills set and tools for the job? If No-I’d recommend watching several how to videos on YouTube. If Yes- I’d recommend watching several how to YouTube videos lol

 

[2003 mustang gt modded]

I did try to search for videos that show how to change timing chain sprockets and couldn't find any.

I'm pretty good with tools. I was thinking of locking the cam with a special tool. But I think the cam will still spin while torqueing.

 

[Bullitt347]

I think there are "flats" on the camshaft that allows a large wrench (7/8" if memory serves) to hold the camshaft while loosening the cam gear bolt.
If you are just changing the cam sprockets, you will need a special tool to hold the timing chain, and more importantly, the chain tensioner in place.
If the front cover is coming off, then that point is moot.

 

[RaggedGT]

I did try to search for videos that show how to change timing chain sprockets and couldn't find any.

I'm pretty good with tools. I was thinking of locking the cam with a special tool. But I think the cam will still spin while torqueing.

I typed in “2003 mustang gt timing chain replacement” these are the first 3 that popped up. The last set I did you use a set of flat bars to lock the cams




View: https://youtu.be/rqsWUZjDtnY?si=NMODPONxnSibyhtu




View: https://youtu.be/sQPaU1cEWVs?si=D1a8Lp8vaBaWrelP




View: https://youtu.be/bMTtatIrkiw?si=FIaQS_74TksHh8lk

 

[2003 mustang gt modded]

I appreciate your support guys, and thoughts of just keeping old sprockets in place? 120k miles on them. Keem them or replace them?

 

[2003 mustang gt modded]

View: https://youtu.be/RyX2LZ6MfSE?si=1ePme5m3m_TWpYxL

 

[2003 mustang gt modded]

The crank timing sprocket mark isn't perfectly centered as shown in video. Pls let me know what you think?

Here is what I did.
1. I set the pulley at tdc.
2.Then took of timing cover, and dots on cam sprockets were facing down, so I turned the engine until they were facing up.
3. Verified the no.1 piston was at tdc. Locked the cams, and installed new chains and verified chain marks and sprocket dots.

 

[squeak93]

Zero reason to replace the sprocket with just 120k unless there is obvious damage/wear or you are putting on new camshafts and don't want to take the factory ones off of the stock cams.

That being said, there are flat spots on the factor cams to "hold" in place while you torque if you chose to do so. New bolts are needed as those are TTY and not reuseable.

 

[2003 mustang gt modded]

I did keep old sprokets as suggested by another mustang owner but now I want to double check everything is done right.

I read a thread where someone bent his valves because something he did wrong.

I didn't how you can bend valves when timing chain marks and sprocket marks all line up. Theriadicaly it's impossible unless chain links aren't the same as a defect from factory Assembly.

Anyways I plan to rotate crank bunch of times, use crank positioning tool and check carefully that top sprockets align as same orientation. Having no possibly of valve damage.