Hi Everyone,

Does anyone know the correct torque for the bolts that hold the engine undercover in place? I've looked all around and searched through the FSM. Typically it will show the bolt torque on the diagram but as you can see it's not specified.


2007 G35 (V36) undercover

In the past I've just made them snug (I think professional mechanics would call it "half a grunt") and I may be a bit pedantic but, while I'm no he-man body builder I have over tightened nuts and bolts in the past which is why I tend to torque nearly everything these days. Better safe than strip the threads!

Thanks in advance!
Larry.

 

I don't think there is a torque but I'd guess something around 40 inch lbs.

 

Hi Cleric670,

Yea, good guess. I just made them "good 'n' snug" but it would be nice to know the actual torque value.

Thanks!
Larry.

 

I'm just guessing the 40 in/lbs because a 1/4-20 fastener is about the same size and they are torqued to 48 in/lbs. Subtracted 20% for a fudge factory because I think the threadserts in the chassis are actually the weak point and thus I came up with 40 in/lbs. Haven't tested it on my vehicle yet though. I usually just hit them with an impact driver and feather the trigger and make it hammer for only 2-3 clicks which from my experience is about 1.5 ft/lbs per impact, I wouldn't really recommend that tool however unless it's something you use every day like I do. A safer alternative would be a battery drill with a clutch set on like.... 9 or so. Then they're all "torqued" the same, QUICKLY, without all the time spent with a ratchet.

 

Good idea Cleric.

When torquing small fasteners, I usually just check the chart. Big stuff, I follow the factory manual.

 

Hah, it's crazy how I literally spend my work days torquing fasteners and I've never seen a metric chart until today. Everything at work is SAE and for anything auto related I check the FSM/Haynes/Chilton/Internet.

 

That's why I love the forum format. Glad you learned something !

 

One has to love some of these questions even though I grew up with the idea that "No Question is Stupid!" Areas like this undercover unit require only one word, SNUG! And doesn't require a bolt torque setting!
Gary

 

I wouldn't imagine the covers needing more than a basic good feeling tighten. but you could always add a dab of blue liquid torque for piece of mind. (just make sure to use blue red is heavy duty)

 

Loctite 242 or 243, stay away from 272 unless the application specifically calls for permanent bonding.

 

no way i'd loctite these, they tend to rust and seize up and then bust and take out the speed nut, i would glob on anti seize and tighten with a nut driver

 

I do the same. I have the aluminum under shroud too.

 

I don't simply because I don't really care if one falls out but I've NEVER had one come loose on it's own. I've never had an issue with mine rusting but it's rarely driven in the winter and our vehicles generally don't have any rust problems here anyways.