oil pump chain

Newbs · 01-28-07, 12:45 AM

What is the slack allowed on the oil pump chain?

Thanks

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cdaleracer669 · 01-28-07, 12:48 AM

its cheap enough... just replace it!! 30$ from mazdatrix 14-1510-N326

RX7Tuner. · 01-28-07, 07:34 PM

No one knows the slack tolerance in the oil pump chain? Come on guys. I thought this forum was a little smarter than that.
I guess I'll have to wander over to Nopistons where they have some real rotorheads...

$100T2 · 01-28-07, 07:51 PM

Quote:

Originally Posted by RX7Tuner.

I guess I'll have to wander over to Nopistons where they have some real rotorheads...

OK, bye!

RX7Tuner. · 01-28-07, 10:07 PM

Quote:

Originally Posted by $100T2

OK, bye!

Wow, not exactly the response I was hoping for.

cdaleracer669 · 01-29-07, 01:39 AM

im sure its in the FSM that is free online. search for FSM (factory service manual) download it, and use it all the time.

cdaleracer669 · 01-29-07, 01:50 AM

i cant find it in the FSM.

RX7Tuner. · 01-29-07, 05:56 AM

I couldn't find it either. I have searched everywhere and I have found two different answers. One said not more than 3/8in another said not more than 1/2in. I have 3 used chains lying around and all of them were exactly 1/2in slack. I just thought it was strange that all my used chains had a 1/2in of slack. One of the chains only had 80,000 on it. If these engines last 150,000 plus, why is my oil pump chain already out of spec after 80,000?

Thanks for any helpful input,
Brian

drago86 · 01-29-07, 08:35 AM

It's hard to find a spec for it because everyone just replaces it when they rebuild, It's 8 dollars,..

Aaron Cake · 01-29-07, 12:06 PM

It's 1/2" max. At least that's the rule I've always used.

I've also never found one out of spec, and thus never replaced it.

RX7Tuner. · 01-30-07, 12:07 PM

So should I just use my old one? It's right at a 1/2 inch.

8$? Where are you buying it? I could only find one at mazdatrix and it was 30 plus shipping, which means about $40 the way they charge.

Aaron Cake · 01-30-07, 02:42 PM

I wouldn't worry about seeing 1/2". As I said, I've never replaced one...I'm sure those experts that do $6000 engine rebuilds will now come in here and tell me how wrong I am though.

RX7Tuner. · 01-30-07, 08:07 PM

Ok I am going to reuse my chain. I think your right Aaron about it being in spec. Like I said, my engine only had 80,000 miles on it. How could it be bad if these engines can go for another 80,000? But if it does go bad I am expecting you to come over and help me change it!

jdmsuper7 · 01-30-07, 11:06 PM

I was always surprised that there was no tensioner assembly on the chain... its very possible that mazda tested one and decided that it wasn't needed. I've seen a few OP drive systems while working at Borg-Warner that have no tensioner, so it seems reasonable.

Aaron Cake · 01-31-07, 10:28 AM

Tensioner is just more stuff to fail.

Nismo Convert86 · 01-31-07, 10:59 AM

Quote:

Originally Posted by Aaron Cake

I wouldn't worry about seeing 1/2". As I said, I've never replaced one...I'm sure those experts that do $6000 engine rebuilds will now come in here and tell me how wrong I am though.

How about a $1200 rebuild? If you buy the Atkins rebuild kit they will send you a new one, do you have to replace it no, but some people are anal about their engines. Some aren't, I would personally replace it.

RX7Tuner. · 01-31-07, 01:12 PM

Question. Has anyone had a chain break on them? Does it just wear so bad that the teeth begin to slip?

Thanks everyone

Aaron Cake · 02-01-07, 11:09 AM

Quote:

Originally Posted by Nismo Convert86

How about a $1200 rebuild? If you buy the Atkins rebuild kit they will send you a new one, do you have to replace it no, but some people are anal about their engines. Some aren't, I would personally replace it.

That's a good point. I think it boils down to whether you want the piece of mind knowing that you have a new chain. Is there a functional difference in this application if the chain is a little bit longer? No. But is there piece of mind in spending the little bit of money that a new chain costs? Absolutely.

Quote:

Originally Posted by RX7Tuner.

Question. Has anyone had a chain break on them? Does it just wear so bad that the teeth begin to slip?
Thanks everyone

I've never seen it, nor have I ever heard of it. The only time I've heard of an oil chain failing was when an oil pump seized.