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ExyDan Profile
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Date Registered: 06-2019
TOTAL POSTS: 2
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T30 QR20DE timing chain sprockets. Do they need to be changed?


My T30, QR20DE with 250 000 km on the meter the timing chain is starting to be in the state for a change. The tensioner is quite out already. Timing advance goes to -7 when letting go of the gas while going forward.

I opened the intake valve timing control cover for a check. The tensioner spring was quite out but chain looked good (I do not now how a bad chain looks). What I also noticed was that the chain has made "teeth marks" on the camshaft sprockets. Are these teeth marks supposed to be there or are the sprockets worn?

The reason I started this thread is because the INT sprocket costs a ton of money! If I buy a timing chain kit, it is cheap and it includes the chains, tensioners, slack guides and EXH sprocket. But INT sprocket is missing. So big question: do I need to invest in the int sprocket or can I just change the chains, tensioners and slack guides?

Photos:
Tensioner:
Image

Sprocket teeth marks:
Image



Last edited by ExyDan, 4/Jul/2019, 7:01 am
4/Jul/2019, 7:00 am Link to this post Send Email PM   Send Private Message Blog
 
tek1975 Profile
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Date Registered: 06-2019
TOTAL POSTS: 9
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Re:


With the amount of work that goes in to doing the timing chain new sprokets might be a good idea. Do a search on youtube for Eric the car guy and has 2 videos on the QR25de timing chain replacement. It might help
29/Jul/2019, 7:45 am Link to this post Send Email PM   Send Private Message Blog
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 5786
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Re: T30 QR20DE timing chain sprockets. Do they need to be changed?


After 250,000kms it would be best to also replace the intake sprocket (phaser) especially with the chain marks on the teeth.
The phasers do have a history of internally wearing over time which causes chain rattle on startup and possibly having it skip teeth so if you are going with a full chain replacement don't leave the intake phaser. It is good insurance.

---
Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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29/Jul/2019, 12:45 pm Link to this post Send Email PM   Send Private Message Blog
 
Screw9948 Profile
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Date Registered: 07-2020
TOTAL POSTS: 24
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Re: T30 QR20DE timing chain sprockets. Do they need to be changed?


Hi,

Any body know where I can get the ext gear, seems to be a bit pricey most are about $500

---
Phil

Camillo, Perth Western Australia

2005 X-Trail, Auto
30/Jul/2020, 4:56 pm Link to this post Send Email PM   Send Private Message Blog
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 5786
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Re:


Amayama has been one online place to get geniune parts at a discount from the dealers. I have used them quite a bit for my T30.

---
Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
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30/Jul/2020, 6:33 pm Link to this post Send Email PM   Send Private Message Blog
 


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