892 replies to this topic

[Snowbird]

Can you drill and helicoil, they are easy to do but best done on a pillat drill or mill to keep tap straight.

[dapleb]

Don't mind if I do .. lickety lick.

Head looks good.

Bugger about that bolt. Not much metal aboot that hole?

[dablik]

I've drilled the original bolt out cos it was loctited with red and not blue, however it's quite shallow so cant really be redrilled to helicoil (done a good few) and the smallest helicoil wont fit me thinks, as daps say's not much metal around the bolt as i 1st thought maybe one size up to M8 but reckon it's a bit dicey so, now i'm thinking of drilling straight through the side case so a bolt right through the width of the side will support where the aluminium is drilled out, just might have to take it to the engineering shop for an opinion..

[Catteeclan]

7mm bolts are available?

[Snowbird]

How about a weld up and redrill option.

Edited by Snowbird, 09 August 2019 - 06:23 am.

[dablik]

7mm bolts are available?

 

Thanks, i did notice that last night might be an option possibly.

[dablik]

How about a weld up and redrill option.

 

I did consider that also but, would need advice from eng shop as would need to be the correct grade alloy, otherwise if it's to soft were back to square one, i was pursuing the helicoil option again last night which might be vialble, said hole actu.ally only has a thread depth of approx 5mm so if it was possible to drill to a further depth off 5ml and put in a 2D or 2.5D helicoil.

[Snowbird]

Is there any reason that hole can't go all the way through to give a bit more thread for a slightly longer bolt? Also check out twinserts as they can take a bigger hole back down to original (a helicoil in a helicoil), we used some at work as one of the engines we do is a b'stard for pulling out cylinder studs and then pulling out helicoils leaving a stripdown and weld up the only option but twinserts have got us out of a few sticky situations.

If we can do it to aero engines a tdm should be fine, I'll bet yamaha castings are better quality than teledyne continental, the phrase 'aircraft quality' usually means a trail of paperwork for something that's worse than you can get off ebay.

[madmopedracer]

what about a good quality chemical metal and retap

its only for retention and not under pressure like a cylinder head bolt

[dablik]

Is there any reason that hole can't go all the way through to give a bit more thread for a slightly longer bolt? Also check out twinserts as they can take a bigger hole back down to original (a helicoil in a helicoil), we used some at work as one of the engines we do is a b'stard for pulling out cylinder studs and then pulling out helicoils leaving a stripdown and weld up the only option but twinserts have got us out of a few sticky situations.

If we can do it to aero engines a tdm should be fine, I'll bet yamaha castings are better quality than teledyne continental, the phrase 'aircraft quality' usually means a trail of paperwork for something that's worse than you can get off ebay.

 

Cheers, my 1st idea was to do just that,drill right through, i imagine a bolt all the way through will hold up the integrity of the c.case as it's fulla metal, also been having a look at ideas re inserts.

what about a good quality chemical metal and retap

its only for retention and not under pressure like a cylinder head bolt

 

Yep i have Milliput which goes off really hard so it's an option, either way if i do it myself the thread hole will have to be longer, and i think it only torques to 12nm so some locktite around the housing could help also.....need to ponder awhile..

Edited by dablik, 09 August 2019 - 05:35 pm.

[dablik]

The thread hole in question is actually a blind hole so dont know if that should make a difference really to how it's fixed so, dropped at the shop this morning for a proper fix, ya man was off today so not sure if it will be an insert or summit else.

[dablik]

Got some shimerooing in on the bench.

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Specs are....... Inlet 0.15 - 0.20 & Exhaust 0.25 - 0.30

 

 

                     Cyl 1                                             Cyl 2

Inlet   0.18     0.19     0.19                        0.19    0.19    0.18

 

Ex           0.29       0.29                                   0.29    0.29

 

Be interesting to see how quickly they tighten up once running.

 

 

[dablik]

Been a bit quiet while awaiting parts, been painting which is really frustrating outside, now all the parts have finally arrived i can crack on..

 

Got a pair of these today, lovely quality, and a rotor to replace the destroyed one offa me boyfriend you know who you are 

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[Favs]

 

"It'll all be over by Christmas"............. 

[dablik]

?????????

[Favs]

Pressie to yourself

[dablik]

Things are not going as planned visited Aircooled Sunday morning to beg borrow and steal some tools and udder stuff and as the afternoon got sunny took advantage and got a little more painting done.

 

I wanna know who stole the thrust washer then !! Haynes makes a point of telling you not to lose it but i aint got one in me replacement, and remember my original rotor got binned so no reference from that.. not one in the replacement starter i have either, i wondered if Haynes had made a goofy but Fowlers fiche verified it as well, guess i better get one then....you'll have a lot of fun iffin you go lookin for oneodem daps me old fruit

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Also previously dismantled the output shaft as far as possible without resorting to pulling cogs of with gear pullers and ordered a replacement circlip per Haynes method of measuring only to find the fit is a bit looser than i would like, so phoned the nice chaps up at simply bearings for a bit of circlip info and repalcement on the way, had been wondering iffin the mk1 output shaft circlip (which is actually a snap ring) would fit the mk2 shaft but the mk2 2001 is approx 3mm wider in girth around the shaft groove, whodathunk it ?

 

And while i think on, the rotor windings bolts are always a pita to get out and often get drilled out, i wonder if they were originally staked like the other bolts in the pic above ??

 

Onwards..

Edited by dablik, 09 September 2019 - 06:39 pm.

[wicklamulla]

Do ya mean the 4TX output shaft has a larger diameter versus the 3VD one? I guess they are different part numbers.

[dablik]

The 2001 shaft for sure, dont know about previous mk2's though, i measured the shaft groove for the external circlip and compared it to a 92 mk1, 2001 is bigger,not checked part numbers though.

[dapleb]

So that washer should be captive in the rotor assembly dabbers!?? Don't think I have any other rotors pulled other than that 9er Juan.

Will have a brevity though not really sure what I'm looking for aS can't remember that part.

Weird that it wouldn't be in that spare rotor if part of assembly!!