left-handed drill bit on stripped t-stat T40...

Post by **xHeart** » 16 Aug 2012, 09:07

After much deliberation with MVS DIYers, see .../viewtopic.php?f=1&t=34806&start=28

I am choosing 1/4" left-handed drill bit to extract, drill out the stripped T40 from t-stat upper housing. The fuel line on disconnected at the rail, sealed and protected.

Any word of caution for before of after this task?

Post by **rspi** » 16 Aug 2012, 09:21

No, just drill the head of the bolt off. Once the head is free, take the housing off and remove the rest of the bolt with vice grips or something. Do not try to drill the entire bolt out.

Are you changing the t-stat? Was the car running cold? That's another thing people change with the temp sensor for no reason.

Post by **xHeart** » 16 Aug 2012, 09:44

T-stat works fine.
Since I have water pump replacement at hand, conditions are just right to replace the stripped T40.
If thermostat fails, it will fewer steps to replace. I have a blue box.

I will slide and screw in the stopper, and won't drill pass the head depth.

Post by **cn90** » 16 Aug 2012, 10:05

I just replaced my tstat last weekend.

Watch out for falling debris (crumbling gasket), put a rag in there to catch debrios.
I posted the DIY here:
https://www.matthewsvolvosite.com/forums ... 5&p=252696

Post by **xHeart** » 16 Aug 2012, 12:37

cn90 wrote:I just replaced my tstat last weekend.

Watch out for falling debris (crumbling gasket), put a rag in there to catch debrios.
I posted the DIY here:
https://www.matthewsvolvosite.com/forums ... 5&p=252696

Very timely cn90.

Post by **xHeart** » 16 Aug 2012, 12:46

Using oil does make drilling not only smooth, it keeps the shavings together. I still have shank to pull out.

: 1/4" left-handed drill bit with stopper, and removed T40 screw head; MVS_0240.jpg (381.63 KiB) Viewed 1387 times

: head is drilled out...; MVS_0236.jpg (431.5 KiB) Viewed 1387 times

: shank still has to come out...; MVS_0237.jpg (401.78 KiB) Viewed 1387 times

mrwillie · Post by **mrwillie** » 16 Aug 2012, 15:08

xHeart wrote:Using oil does make drilling not only smooth, it keeps the shavings together. I still have shank to pull out.

MVS_0240.jpg

MVS_0236.jpg

MVS_0237.jpg

Are you using grip pliers to get the shank out?

Post by **xHeart** » 16 Aug 2012, 15:32

I am thinking of using the two nut technique. It is discussed in the link I referenced above.

mrwillie · Post by **mrwillie** » 16 Aug 2012, 15:36

I'll look again, but I really don't understand what he was doing w/ the nuts stacked on top of each other. Not sure how that would back the screw shank out.

Post by **xHeart** » 16 Aug 2012, 15:48

Plausible.
Would the nut thread from the top? It may go in counterclockwise.
I have posted the questing to Jim.