68' M20C fuel selector won't reseal

[zerobearing2]

Just wrapped up another annual, and low and behold, the dang fuel selector valve won't reseal after inspection. Anyone have any advice? We've tried several times, with no luck. I guess I'm looking at sending it out for overhaul. It works great, except for the leaking. Would hate to have to overhaul this turkey every annual just to get it sealed up. Anyone have any tips?

Cheers,
dave

[MB65E]

There is a Stato-seal at the -3 bolt. Many people think it's just a washer. It should be replaced along with the gasket. 

Lasar has the kits. I was impressed. I ordered the gasket and it came with the Stato-seal. Thanks Mr. Dan @ Lasar. 

-Matt

[jetdriven]

I overhauled mine at the shop during one annual. The kit was around 60$ From the guys at LASAR.  That's been 2.5 years now it still doing great. 

[pirate]

I sent mine to Lasar 6 years ago and still works great. very quick turnaround. Money well spent. 

[mike_elliott]

On ‎11‎/‎16‎/‎2015‎ ‎5‎:‎49‎:‎32‎, zerobearing2 said:

Just wrapped up another annual, and low and behold, the dang fuel selector valve won't reseal after inspection. Anyone have any advice? We've tried several times, with no luck. I guess I'm looking at sending it out for overhaul. It works great, except for the leaking. Would hate to have to overhaul this turkey every annual just to get it sealed up. Anyone have any tips?

Cheers,
dave

If it is leaking, it can also be sucking air when engine is running. This will have a bad outcome...Get it fixed at Lasar or Don Maxwell's and keep from ending UWOF....

[zerobearing2]

Alrighty then, looks like I'll send it for overhaul -- seems to make the most sense after hearing from you guys. Thanks for all the feedback!

[zerobearing2]

Just wanted to report back incase anyone finds this thread later.

We sent the fuel selector out to LASAR, they overhauled and after 4 hours of flight time, all is working perfectly. No more leaks  

 

Thanks everyone for all the input.
Dave

[Bob_Belville]

Yup, we "rebuilt" mine at the last annual,. Cleaned, replaced o-rings and stato-seal. It was not leaking fuel but it was sucking in air which screwed up the fuel flow reading. JPI diagnosed the likely culprit and had me put a drop of oil on the shaft of the selector lever which fixed the flow reading problem and isolated what needed to be done.

[larryb]

Bob, can you comment on what you saw in your fuel flow reading?

[Bob_Belville]

50 minutes ago, larryb said:

Bob, can you comment on what you saw in your fuel flow reading?

Sure, very erratic and impossible flow rates. Usually below actual, e.g. 5.5 gph @ 65% power, but spikes to 22 gph on take off. This affected fuel used totalizer as well. On one fillup indicated used was 20-30% higher than actual. K factor is well calibrated and JPI is normally within 1% of actual.