Dual 22R Timing Chains

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Date: Thu, 11 Dec 1997 14:15:50 -0500
From: Darren Floen 
Subject: 22R timing chains
To: Toy4x4@tlca.org

Jeff wrote:

OK, here's the situation: I'm going to be doing some work to my '86 
22R-TE engine.  One thing I would like to do is change the timing 
chain/gears as a preventative measure (the engine currently has 110k 
miles on it, and while these could be good for another 60k miles, I'd 
rather not chance it).

Toyota made double-row timing chains for this engine until late '84 or 
mid '85 (not sure which). 

Is is worthwhile to replace the single-row timing chain setup on my 
engine with the double-row components from an earlier 22R? It seems to
me 
that double row timing chains would have more inherent strength, just by 
being physically bigger: stress would be distributed across a greater 
surface area.

In addition to obvious components like chains. gears and tensioners, I 
would assume such a swap would also mean changing the timing chain
cover, 
oil pump, and possibly water pump (which may be worth changing anyway,
as 
long as I have it off).

Does anyone have any thoughts/opinions on this on this?  Also, how long 
do 22R timing chains (either single or double row) typically last?

I apologize for reposting this (yet again!), but the difficulties with 
the digests prevented me from seeing any of the answers to my original 
post on this topic, and I would like to do this work ASAP.  If someone 
would repost the answers to my original thread, I'd be very
appreciative.

Thanks. I am *not* going to repost this question again.

Jeff


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Jeff Moskovitz                                 1986 22R-TE truck, stock
Senior Support Specialist                      (but that will change!)
Claris Corporation

jeff_moskovitz@claris.com




Jeff,while i am a big fan of double row timing chains,i don't really
think that one is necesary in you case.The reason i say this is becaus
many people on this list have 100k miles on a single row chain.I don't
think the swap is very cost effective.iI understand that the swap kits
from LC is around $500?A new single row chain is probably $100,so take
that $400 that you saved and get a locker :)

Darren Floen
85 xtracab

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Date: Thu, 11 Dec 1997 11:51:48 -0800
From: Jim Brink 
Subject: 22R timing chains
To: Toy4x4@tlca.org

Jeff Moskovitz wrote:
> 
> OK, here's the situation: I'm going to be doing some work to my '86
> 22R-TE engine.  One thing I would like to do is change the timing
> chain/gears as a preventative measure (the engine currently has 110k
> miles on it, and while these could be good for another 60k miles, I'd
> rather not chance it).
> 
> Toyota made double-row timing chains for this engine until late '84 or
> mid '85 (not sure which).
> 
> Is is worthwhile to replace the single-row timing chain setup on my
> engine with the double-row components from an earlier 22R? It seems to me
> that double row timing chains would have more inherent strength, just by
> being physically bigger: stress would be distributed across a greater
> surface area.

Jeff,

I have seen both the single and double chains fail at about the same
mileages. I have also seen both last in excess of 300K miles as well.
While I am sure there is something to be said for an extra row of chain,
in the practical world of working on both, I have not seen any advantage
in the double chain.

Replace the chain you have now as a set with the new sprockets, guides,
and tensioner, and you will be covered for another 100K miles of trouble
free operation. Use a kit with good quality parts.

Yes, replacing the water pump is a good idea at this time. 22R pumps are
relatively inexpensive and replacement is good, preventative
maintenance. Don't forget to check your belts and hoses at the same
time.


- --
Jim Brink--Toyota/ASE Certified Technician             '86 Std. Bed 22R
Manhattan Beach, CA				   32x11.50/15 BFG M/Ts
brinkjm@earthlink.net                             	
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TLCA# 6184/ Friends of the Mojave Road (FOMR)

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