Valve Clearances 2.7 (3rz)

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blackmo92
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Mon Mar 19, 2018 1:11 pm

Hi Guys,

So I decided to check my valves on my new to me (18 year old) 2.7 3rz Dual Cab as I doubt they had been checked / adjusted before. There was a fair amount of carbon / gunk on the cover and the spark.plug oil seals were crumbly. That being saidnthe timing chain and everything else looks solid.

Exhaust range .25 - .35
Intake range .15 - .25

Below are my results

Ex. In.
(4)
0.254. 0.203
0.305. 0.203
(3)
0.254. 0.203
0.203. 0.203
(2)
0.254. 0.203
0.254. 0.203
(1)
0.203. 0.203
0.203. 0.203

As you can see 3 exhaust valves are too tight and 4 are at .25. the intake valves are all within spec.

I have mucked around with the painful shim removal tool and was able to remove the exhaust shims from 1-3 however the furthest back (.254) I just cannot remove. I don't particularly want to remove.the exhaust cam so i am curious to see if you think I'd be okay to leave the furthest one back at .254 while adjusting the all the other to be around .30?

Appreciate any advice!

Cheers
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Mud Dog
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Mon Mar 19, 2018 2:31 pm

Were those specs for hot or cold?

If the specs given were for hot and checked when hot, them it's still within spec and I would leave it. I would also tend to lean more to the tighter clearance with an old motor since there could be a little hollow wearing on the rockers, unless you measured the clearance at the cam. :winkx:
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blackmo92
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Mon Mar 19, 2018 9:27 pm

Thanks for the reply mud dog ☺ Measured the clearances cold using a feeler gauges under the individual cam lobes as per the FSM. I thought the 3rz was prone to burnt exhaust valves?
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pietpetoors
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Mon Mar 19, 2018 9:41 pm

I thought the 3rz was prone to burnt exhaust valves?
First time I hear of that.
Those engines easily runs 500k km without being opened.
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Mud Dog
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Tue Mar 20, 2018 12:11 am

blackmo92 wrote:
Mon Mar 19, 2018 9:27 pm
Measured the clearances cold using a feeler gauges under the individual cam lobes as per the FSM.
You should be OK if that's what the manual says. Also haven't heard of the 3RZ being prone to burning valves. As Pieter indicated, these are very robust, reliable and trouble free motors :winkx:
When your road comes to an end ...... you need a HILUX!.

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Life is like a jar of Jalapeño peppers ... what you do today, might burn your ass tomorrow.
Don't take life too seriously ..... no-one gets out alive.
It's not about waiting for storms to pass. It's about learning to dance in the rain.
And be yourself ..... everyone else is taken!
blackmo92
High Range 2WD
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Tue Mar 20, 2018 3:29 am

How interesting! All the Tacoma forums in the states have the 3rz and they all mention how important it is, should I even bother adjusting g the ones that are .005mm too tight?
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GTO
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Mon Mar 26, 2018 7:25 am

I did mine last year but mine was the intake valves on No 4 cylinder.

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