Welcome Guest [Log In] [Register]
Posted ImageWelcome to the all new Geo Metro Forum. We hope you enjoy your visit.

You're currently viewing our forum as a guest. This means you are limited to certain areas of the board and there are features you can't use and images you can't see. Registration is simple, fast, and completely free. If you're already a member please log in to your account to access all of our features:

Join our community!




Username:   Password:
Add Reply
How do I torque the camshaft bearing bolts?; You know, those extension bolts that also hold on the valve cover
Topic Started: Apr 18 2012, 06:18 AM (3,025 Views)
jaevans
Elite Member
[ *  *  *  *  * ]
OK, quick question. I'm putting my head back together after swapping lifters and am not sure what the standard procedure is to torque the extension bolts that fasten the camshaft bearings and also are used to hold on the valve cover. Are there socket extensions that are hollow or do I need to get a 10mm socket that is really quite deep?

Thanks,
John - Colorado Springs, CO
Offline Profile Quote Post Goto Top
 
Deleted User
Deleted User

Use a 6 point deep socket. The torque specification is 8 foot pounds.

8 foot pounds is not very tight.

Do not break the fasteners.
Quote Post Goto Top
 
Bad Bent
Member Avatar
Facetious Educated Donkey

And without the deep sockets I tightened them all by hand to the same feel of torque. I was able to tighten one with a torque wrench and I did it at 4 and then 8 foot pounds - with an inch pound torque wrench. After doing one with the torque wrench I tightened two of the long (used to hold on the valve cover) ones with a box end then repeated the procedure of torque one with a torque wrench and two without. You can make the same degree of rotation or even count the sides of the bolt as they turn and turn them all the same amount. I used feel. tolerance might be 1 foot pound?? :dunno The important thing is to tighten them all evenly and not to over torque them. Two years later and no problems. :D
Offline Profile Quote Post Goto Top
 
jaevans
Elite Member
[ *  *  *  *  * ]
Thanks Glenn and Bad. I went looking for a deep 10mm socket and none were deep enough, so I think I'll go with the box wrench technique. I can torque the #2 bolts to spec and get a feel for "feel" as well as turns from snug.

John
Offline Profile Quote Post Goto Top
 
jaevans
Elite Member
[ *  *  *  *  * ]
So what bolts are these?? Are these different than the 6 bolts that fasten the bearings around the camshaft (4 extension bolts and 2 center bearing bolts)??

Camshaft bearing cap bolts
Three cylinder...................................................................96 in-lbs
1998+ four cylinder...........................................................96 in lbs
Offline Profile Quote Post Goto Top
 
starscream5000
Member Avatar
Got 70 MPG?

They're the same thing.
Offline Profile Quote Post Goto Top
 
jaevans
Elite Member
[ *  *  *  *  * ]
OK, so now I am confused, probably due to my original wording. Is it just the nuts on top of the extension bolts that get the 8 inch-lbs ??
Offline Profile Quote Post Goto Top
 
Coche Blanco
Member Avatar
Troll Certified

Inches
Ft
12"
1'
96"
/
12"
=
8'

To answer your question, 96in/lbs is 8 ft/lbs
Offline Profile Quote Post Goto Top
 
starscream5000
Member Avatar
Got 70 MPG?

It's 8 ft/lbs, or 96 in/lbs on ALL 6 cam cap bolts.
Offline Profile Quote Post Goto Top
 
jaevans
Elite Member
[ *  *  *  *  * ]
Dang, and I just cautioned myself about reading the specs carefully. Thanks for clarifying - must be a senior moment for this engineer (we supposedly know how important units are).

Anyway, I am still dealing with figuring out how to use a torque wrench to measure that on the long extension bolts. I've not found a long enough deep 10mm socket yet. Might just have to guess based upon the feel of the #2 bearing bolts.
Offline Profile Quote Post Goto Top
 
starscream5000
Member Avatar
Got 70 MPG?

jaevans
Apr 20 2012, 01:35 PM
Anyway, I am still dealing with figuring out how to use a torque wrench to measure that on the long extension bolts. I've not found a long enough deep 10mm socket yet. Might just have to guess based upon the feel of the #2 bearing bolts.
Pay attention to how much further you have to turn the #2 bolts once they are snug and just put a wrench on the taller ones and do the same to them.

My deep well sockets are long enough, but I DO have to have the wrench sitting part-way in the socket rather than all the way...
Offline Profile Quote Post Goto Top
 
jaevans
Elite Member
[ *  *  *  *  * ]
Success - Harbor Freight has a set of 1/2" deep sockets with plenty of room - item number is 67872 . These were on sale and I got a great discount on a 20-200 inch pound torque wrench ($9.99 end price). In spite of what some folks have said here, other folks say the accuracy on their torque wrenches is pretty good.
Offline Profile Quote Post Goto Top
 
Deleted User
Deleted User

Please don't break those M6 fasteners.

Breaking M6 fasteners leads to more posting.

More posting means less driving your Geo Metro.

Less driving your Geo Metro means paying more for fuel to drive whatever it is you have that gets 17 MPG.

Driving whatever you have that gets 17 MPG leads to not eating, coma, and eventually, death.

Quote Post Goto Top
 
jaevans
Elite Member
[ *  *  *  *  * ]
Glenn, you sound like a Directv commercial ;) Actually, I've been driving my backup for awhile - my 83 Rabbit GTI - it doesn't get as good mileage as the Metro but 30 MPG is a lot better than most of what folks are driving. Plus, it has power when needed and is so darned fun to drive. I originally got the Metro as a backup to the rabbit when I sold my dependable 2000 Outback to finance my daughter's car. I'm having more fun and learning more with these two cars than I've ever learned - so much so that I am looking for another Metro to possibly replace the GTI. Since I have one Metro, I have the patience to find another good Metro.

OK, I'll shut up and get back to working on the metro and NOT breaking bolts.
Offline Profile Quote Post Goto Top
 
Duck Sauce
New Member
[ *  * ]
I have a question. I have a 93 metro and I broke an extension bolt getting it off, as, apparently, it was over-torqued (or just old?) I got it out with a combination of a flat tip, tiny needle nose pliers, and fingernails. Now I can not seem to locate replacements for them. Does anyone know where I could find new replacements, or should I hit up the junkyard?
Offline Profile Quote Post Goto Top
 
1 user reading this topic (1 Guest and 0 Anonymous)
Go to Next Page
« Previous Topic · Engine Tech & Diagnostics · Next Topic »
Add Reply