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I F...ked up big!

2159 Views 14 Replies 11 Participants Last post by fatman, Jul 23, 2012

dmoralesbello

Discussion Starter · Jul 22, 2012

While switching the oil cooler lines on my PS to Fren Tubo lines I stripped the threads on the engine case where the line feeds into. The bike is now at the dealer waiting for an opinion from a welder regarding possible repair or (worse case scenario) having to replace the engine case

.
Any helpful hints or thoughts?

Any "been there, done that"?:think:

1 - 15 of 15 Posts

EIGHTfortyEIGHT

· #2 · Jul 22, 2012

Its not the end of the world

Check these out ++ TIME-SERT Threaded inserts for stripped threads, threaded inserts, thread repair stripped sparkplug's, Ford sparkplug blowouts, threaded inserts threaded, repair stripped threads, stripped threads, inserts threaded inserts, Ford spark plug repair,

I have used them before. Insert them with loctite 510 and the repair will be permanent.

I would do this before welding or a new case.

maxwellsmart

· #3 · Jul 22, 2012

Agreed, The thread inserts are the way to go. I have used them extensively with VW and Porsche engine cases for different reasons. I HIGHLY recommend using a solid type and NOT a coil type. The coil type have a tendency to leak more with less surface prep.

Don't freak out; its easy to fix as long as you can drill and tap that area. pushing out the shavings from the oil filter access should be easily done too.

dmoralesbello

Discussion Starter · #4 · Jul 22, 2012

Will these inserts be able to handle the pressure inherent to the oil lines?

Tom_S.

· #5 · Jul 22, 2012

When we prepped my 450 Desmo engine for racing, all of the treaded holes in the cases were fitted w/heli-coil inserts. The motor's been apart a couple of times since then (most recently for a broken connection rod...) and they're holding up just fine. I'm glad we did it.

EIGHTfortyEIGHT

· #6 · Jul 22, 2012

The Time-Serts I linked above are many times used to repair stripped spark plugs, so no problem with pressure.

Also, like said above Time-Serts are solid not heli-coils. I would not use heli-coils.

Air_Cooled_Nut

· #7 · Jul 22, 2012

dmoralesbello said:
Will these inserts be able to handle the pressure inherent to the oil lines?

Bah! That's not much pressure, the Time-serts will easily do it, no worries.

When drilling, pressurize the case with compressed air so the bits will blow out.

muzzmann

· #8 · Jul 22, 2012

EIGHTfortyEIGHT said:
Its not the end of the world

Check these out ++ TIME-SERT Threaded inserts for stripped threads, threaded inserts, thread repair stripped sparkplug's, Ford sparkplug blowouts, threaded inserts threaded, repair stripped threads, stripped threads, inserts threaded inserts, Ford spark plug repair,

I have used them before. Insert them with loctite 510 and the repair will be permanent.

I would do this before welding or a new case.

8 -

Glad you posted this . I had used a product similar to this many many years ago ...when I mentioned to my machinist \ fab guy he wasnt sure of the product and I was never able to find it .

Thanks !

Muzz

ncgt1000

· #9 · Jul 22, 2012

I used these on my '73 BMW R75/5 when I stripped a cylinder head stud (in the engine case) while re-torquing the head during a valve adjustment. It's been there for 20+ years and 20K miles with no problems at all.

Chook

· #10 · Jul 22, 2012

Helicoils are the go
I have used these in many applications especially aluminium
There are a lot of manufacturers that supply aluminium products that fit these from new they hold up better.
Also in this application they may be more suitable because you dont have to oversize the damaged thread as much as you would to fit a steel insert.

Helicoil | Helicoil Insert | Helicoil Inserts | Helicoil kit | Helicoil Thread Repair Kits | Heli-Coil | Helicoil India | Wire Thread Insert | Helicoil Manufacturers | Helicoil Suppler

cb4265

· #11 · Jul 23, 2012 (Edited)

Time serts are far superior than helicoils for this application.

If anything was going to leak it would be the helicoil.

I used to sell time serts to engineers that built race boat motors, never had a failure.

Scroll down to page 07.0545 http://www.wurthusa.com/web/media/downloads/pdf/pdf_catalog/07_ServiceRepair_March2012.pdf

Craig

dmoralesbello

Discussion Starter · #12 · Jul 23, 2012

Many thanks for all the info on the serts. Seems like it's a no brainer that it's just the way to go. So why is this dealer not even considering this possibility and tooling around with ideas like welding and replacing the engine case? Simple ignorance? Dishonesty? Maybe using the inserts is not common knowledge to all techs?

Chook

· #13 · Jul 23, 2012

cb4265 said:
Time serts are far superior than helicoils for this application.

If anything was going to leak it would be the helicoil.

I used to sell time serts to engineers that built race boat motors, never had a failure.

I disagree, Time serts require more material to be removed when fitting
If you have a look at where the fitting go's into the crankcase there is not alot to play with. And as the fitting seals on the flat area or dowdy washer and not on the thread (like a tappered fitting would seal) a Helicoil would be the better option

greggers

· #14 · Jul 23, 2012

dmoralesbello said:
Many thanks for all the info on the serts. Seems like it's a no brainer that it's just the way to go. So why is this dealer not even considering this possibility and tooling around with ideas like welding and replacing the engine case? Simple ignorance? Dishonesty? Maybe using the inserts is not common knowledge to all techs?

Keep in mind the dealer also has to comply with what Ducati recommends and allows when they do service. Both the dealer and DNA are incurring liability for any fix they do, so they have to keep it by the book.

fatman

· #15 · Jul 23, 2012

No Heli Coils for this application

I'm older than dirt, probably old enough to be a Father to 90% of this forums members! Heli coils have their place, used them still do, still love them in the right application. Key words: Right application!!!
But for your type of repair I WOULD NOT use them. Go with the Wurth or similar. Plain and simple!
1. I've seen Heli coils come out with the srcew/bolt, whatever, especially in items that see heat cycles & vibrate.
I used to make guide bushings for making sure I stayed square to the surface. Then drilling & tapping out the damaged thread when I couldn't get the part in a Bridgeport or lathe.
My 2 cents after many years. Good luck!

1 - 15 of 15 Posts

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