Transmission Service (1 Viewer)

[Roc14]

Heads up, 2011 LX570 transmission service diy. Torque the drain plug to spec and it rounded out the pan. Ended up with a small leak.

Ordered a new pan, pan bolts, oil strainer, and gaskets. Drilled a hole in the old pan to drain the fluid out of the pan carefully. Removed the pan bolts slowly and dropped the pan. Removed the oil strainer and o-ring.

Installed the new o-ring and oil strainer. While putting on the new pan bolts, I initially did it by hand finger tight. Set the 3/8 torque wrench at 14 ft lbs, despite manual asking for 15 ft lbs. Tighten the first bolt to spec, and then the fun starts. Went to the 2nd bolt happend to be top left corner. As I was tightening to spec it snapped! Had a wtf moment! Torque spec was 65 in lbs. Bolt is located where the pieces of crap emissions pipe and nox sensor is. Very tight space. Grabbed a small pair of vice grips and the fun began slowly pulling the bolt through the top with PB blaster.

Tightened everything down along with the drain plug by hand once snug let off to prevent snapping an other bolts. Went for a test drive and no leaks.

Ordered a 1/4 ratchet/socket set and torque wrench. Anyone have issues with torque specs and bolts snapping. This was a pain in the ass. BTW have 215k miles.

 

[gasman4u]

that sucks. It sounds like your torque wrench may be at the edge of its range. You’ve already got the solution (assuming it’s calibrated well) on the way with the smaller torque wrench. Double check your settings and torque values too. Don’t do it when you’re tired. Make sure you’re not using antiseize or another lube on the threads of the bolts. If you do all these things, I am thinking this will be the last time this issue comes up for you. Unless I’m missing something.

Ideally, you want the torque setting to be in the middle of your torque wrench range that you’re using. If it’s not, the further towards the “edge” (high/low) of your torque wrench, the less accurate the delivered torque. I hope that makes sense.

 

[ceylonfj40nut]

Heads up, 2011 LX570 transmission service diy. Torque the drain plug to spec and it rounded out the pan. Ended up with a small leak.

Ordered a new pan, pan bolts, oil strainer, and gaskets. Drilled a hole in the old pan to drain the fluid out of the pan carefully. Removed the pan bolts slowly and dropped the pan. Removed the oil strainer and o-ring.

Installed the new o-ring and oil strainer. While putting on the new pan bolts, I initially did it by hand finger tight. Set the 3/8 torque wrench at 14 ft lbs, despite manual asking for 15 ft lbs. Tighten the first bolt to spec, and then the fun starts. Went to the 2nd bolt happend to be top left corner. As I was tightening to spec it snapped! Had a wtf moment! Torque spec was 65 in lbs. Bolt is located where the pieces of crap emissions pipe and nox sensor is. Very tight space. Grabbed a small pair of vice grips and the fun began slowly pulling the bolt through the top with PB blaster.

Tightened everything down along with the drain plug by hand once snug let off to prevent snapping an other bolts. Went for a test drive and no leaks.

Ordered a 1/4 ratchet/socket set and torque wrench. Anyone have issues with torque specs and bolts snapping. This was a pain in the ass. BTW have 215k miles.

Many stories out there mixing up in-lbs spec vs ft-lb specs. 65 in-lbs is about 5.5 ft-lbs.

 

[Jdt30]

I’ve done the transmission service myself once. I pay for it to be done now.

 

[KLF]

Ya I'm confused. You set your wrench to 14 ft-lbs, but you said the spec is 65 in-lbs. And you blame the bolt for snapping? Maybe I'm misreading.

14 ft-lbs x 12 is 168 in-lbs.

 

[marques]

Yes, i’m also scratching my head. Did the M6 bolts (65 in-lbs torque spec) get torqued to > 14 ft-lbs?! That would pretty much guarantee they snap by being overtorqued by 3x.

I like to torque the M6 pan bolts in stages. Go all the way around just finger tight, then go all the way around at 1/2 the torque value in criss-cross pattern, then repeat with the actual torque spec. Then repeat. And repeat again a 3rd time 1/2 hour later.

 

[ryanCA]

I have read this happening on this forum before.

Glad you got it taken care of.

I am almost at 300k miles - stock trans.

 

[hoot504]

I have read this happening on this forum before.

Glad you got it taken care of.

I am almost at 300k miles - stock trans.

What year truck Ryan?

 

[ryanCA]

What year truck Ryan?

this is the 08

of the newer 200s in the fleet - those are all sub 50k miles

 

[Roc14]

Thanks for chiming in. I followed the torque spec for the drain pan bolt and it snapped the thread welding in the pan. Along with that had a brain fart moment with the torque wrench and spec for the drain pan bolt. Oh well good excuse to put a new filter, gasket, and pan on. Overall drained about almost 10 quarts with 2 drains. Pan drop allowed for another quart.

When the pan was dropped the dluid looked clean in the transmission. That was interesting. No need to drop the pan really Iguess.

Cheers!

Still drives like the day I bought it over 12 years ago. Can't seem to get rid of it.