RunRyder RC
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 4202 views POST REPLY
HomeTurbineAircraftHelicopterTurbine Helicopters › Jetcat PHT3-3 starter squeal
05-15-2011 08:11 PM  7 years agoPost 1
heliraptor

rrKey Veteran

Colchester, Essex, UK

My Posts: All  Forum  Topic

Hi

The last three flights I have noticed as the starter engages during the cool down run, on the odd occasion there is a high pitched squeal, just momentarily as the starter engages.

Any ideas whats causing this, and the cure please ?

Cheers

PM  EMAIL  HOMEPAGE  Attn:RR  Quote
05-15-2011 08:33 PM  7 years agoPost 2
modtron

rrKey Veteran

Oxford. UK

My Posts: All  Forum  Topic

Lee,
Your Bendix coupling is running dry.

Put a couple of drops of TriFlow oil on the starter shaft and then move the bendix by fingue tip to get it into the groove.

All should be well from then.

It's worth lubricating every so often as it dries out with the heat from the engine.

modtron
Oxford UK

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
05-15-2011 09:28 PM  7 years agoPost 3
heliraptor

rrKey Veteran

Colchester, Essex, UK

My Posts: All  Forum  Topic

Thx Nigel

Someone mentioned that at the field earlier, however they said they sprayed WD40 on it, then it wouldnt work and they had to strip it all back to clean it! So before I delved in thought I'd ask.

I appreciate your superior knowledge and will do that first thing.

Cheers

Lee

PM  EMAIL  HOMEPAGE  Attn:RR  Quote
05-15-2011 09:35 PM  7 years agoPost 4
modtron

rrKey Veteran

Oxford. UK

My Posts: All  Forum  Topic

NEVER use WD40 - it's not to be used as a lubricant !

modtron
Oxford UK

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
05-27-2011 11:58 PM  7 years agoPost 5
Jeff polisena

rrElite Veteran

westpalmbeachflorida usa

My Posts: All  Forum  Topic

Mine squeaks from the contact point when starter engages ,I have not taken apart to see if there is rubber on contact point but like a belt in car slipping.I sent email to get replacement parts but no reply from Airstar int

I stole it ,flew it and gave it back ;)

PM  EMAIL  GALLERY  Attn:RR  Quote
07-06-2011 04:26 AM  7 years agoPost 6
Kaango

rrNovice

Lone Tree, CO USA

My Posts: All  Forum  Topic

Bendix
Many times the O ring is unseated or being unevenly forced against the shaft. Make sure the starter unit is exactly aligned. I also replaced my O ring and solved the issue instantly.

PM  EMAIL  GALLERY  Attn:RR  Quote
07-06-2011 06:50 AM  7 years agoPost 7
Double Decks

rrApprentice

Poole Dorset

My Posts: All  Forum  Topic

just had the same problem changed starter 0-ring

PM  EMAIL  GALLERY  Attn:RR  Quote
07-13-2011 02:23 PM  7 years agoPost 8
Héli Suisse

rrApprentice

Geneva Switzerland

My Posts: All  Forum  Topic

I had the very same problem I realigned the starter engine and the problem was solved!

PM  EMAIL  GALLERY  Attn:RR  Quote
08-03-2011 12:45 PM  7 years agoPost 9
Jeff polisena

rrElite Veteran

westpalmbeachflorida usa

My Posts: All  Forum  Topic

Realigning works but for how long ? I need to order before it starts again .Also my wren 44 is starting to sound funny too .

I stole it ,flew it and gave it back ;)

PM  EMAIL  GALLERY  Attn:RR  Quote
08-03-2011 03:40 PM  7 years agoPost 10
Kaango

rrNovice

Lone Tree, CO USA

My Posts: All  Forum  Topic

Great!
Next heli try a belt-less set up like Jakadofsky or Pahl! I blew a belt on a PHT3 set up and lost the heli along with 3.5 acres of state park the burned as a result. My Bell 430 has a Jako with a built in gear box and clutched gear output. Add in a flawless kero start and it's much simpler.

PM  EMAIL  GALLERY  Attn:RR  Quote
08-03-2011 05:16 PM  7 years agoPost 11
helibeli

rrApprentice

wales.uk

My Posts: All  Forum  Topic

Just the thought of belts turning at 100k rpm scares me.

PM  EMAIL  GALLERY  Attn:RR  Quote
04-02-2013 06:18 PM  5 years agoPost 12
Thomas Ekdahl

rrNovice

Tønsberg, Norway

My Posts: All  Forum  Topic

I have a Jetcat PHT3-3 developing the same squeal
https://dl.dropbox.com/u/36859753/J...up%20squeal.MOV

Is this squeal sound something I'm able to fix myself, or do I have to send it back to JetCat Germany for fixing? I have sendt a mail asking about it to JetCat, but they don't answer.

I hope I don't have to send it back since I have only flown 14 flights since last service in Germany, and the turn around time is usually around 3 months for me. Thats to slow and I would loose this season too.

PM  EMAIL  Attn:RR  Quote
04-02-2013 06:41 PM  5 years agoPost 13
El Bucho

rrApprentice

VA

My Posts: All  Forum  Topic

Sounds like a bad starter O-Ring to me...I would start with that since it's only a couple of bucks to replace. If that doesn't do it then move on to more expensive fixes

PM  EMAIL  GALLERY  Attn:RR  Quote
04-02-2013 07:21 PM  5 years agoPost 14
modtron

rrKey Veteran

Oxford. UK

My Posts: All  Forum  Topic

Listening to the video - 100% starter O ring.

Very simple job to do - if you have trouble locating the correct O rings, send me a pm or email as I keep them as a stock item.

modtron
Oxford UK

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
04-03-2013 02:05 PM  5 years agoPost 15
Thomas Ekdahl

rrNovice

Tønsberg, Norway

My Posts: All  Forum  Topic

I think I already have the correct starter O-ring, if it does not fit I will contact you Modtron.

Is this a operation that will void the warranty on the engine and mechanics? (A lot of the screws on the frames are plumbed).

Does anybody have a step by step advice on how to disassemble as little as possible of the frames to get the starter engine out and change the o-ring?

Will I have any alignment problems while adding it back in?

Thank you.

PM  EMAIL  Attn:RR  Quote
04-03-2013 03:28 PM  5 years agoPost 16
modtron

rrKey Veteran

Oxford. UK

My Posts: All  Forum  Topic

Hi Thomas,

It can be done very easily with some patience.

It should not affect your warrenty, but if you are at all worried, then you would have to ship it to your nearest Jetcat service centre.

First job is to remove the plastic box on the RHS.

Carefully remove the temp probe screw and gently move the socket out of the way.
Then remove the 2 retaining bolts for the box and again gently move to one side.
Now you can remove the 2 bolts on each side that hold the motor mount in place and slide it back out of the frames.

When you get the starter out, You can hook the worn "O" ring out with the end of a small allen key or screwdriver.
Make sure the end is clean and clear of debris before inserting the new "O" ring. It can be quite tight, just be careful and take your time.
I normally put some very light Teflon based oil on the Bendix shaft of the starter to help it in future operations as it dies out when in operation inside a body shell.

Then re-install in reverse order and again, take your time to re-align the Bendix drive to the end of the turbine shaft.
If it's not true, it can rub during the start / stop sequence again.

Hope that helps.

modtron
Oxford UK

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
04-03-2013 06:37 PM  5 years agoPost 17
Thomas Ekdahl

rrNovice

Tønsberg, Norway

My Posts: All  Forum  Topic

Thanks a lot Modtron. This is really helpful. I guess your Turbine is a PHT3 and mine is a PHT3-3 - that means that my start motor is placed between the frames, behind the main shaft and in front of the turbine, under the gyro and over the servos (a less service friendly position I would say).

But if I remove the gyro, get the starter loose between the frames and lift it up vertically, it could go. I'll make a try and tell you how it goes.

As I understand the starter is not at all engaging the turbine via axels, bearings or other stuff when not running. So a straight up lift should work without damaging anything (only looking after the wires)?

Thanks again for the support.

PM  EMAIL  Attn:RR  Quote
04-03-2013 06:51 PM  5 years agoPost 18
modtron

rrKey Veteran

Oxford. UK

My Posts: All  Forum  Topic

My mistake - I have PHT3"s and PHT3-3"s and service both types.
it is very similar, just a little bit more involved to get the starter out of the frames.
Again, a little care and patience will see success.

modtron
Oxford UK

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
05-07-2013 08:29 PM  5 years agoPost 19
Thomas Ekdahl

rrNovice

Tønsberg, Norway

My Posts: All  Forum  Topic

I have finally got around and changed the starter o-ring. I have also greased the Bendix shaft with teflon. The operation was suprisingly simple. The old o-ring was very stiff and not rubbery - and the new one was easy to press in place (easier than removing the old). Alignment was also fairly easy.

I did a few test starts, and the first start was quiet as it should be, but on cool down the sound was back. Tried again, and it sounds much better on startup, but starts to squeal on cool down.

I tried to add teflon to the bendix shaft, and it was quiet on start up, but squeaking on cool down.

Looks like it is most happy when newly oiled, and that the oil vapors while it runs, creating the sqeaky noise again on cool down.

What is your recommendation? Should I just forget it and tell everybody that this is a standard JetCat noise, can I do something else myself, or has it to go back to JetCat for service?

Thank you.

PM  EMAIL  Attn:RR  Quote
05-07-2013 09:19 PM  5 years agoPost 20
modtron

rrKey Veteran

Oxford. UK

My Posts: All  Forum  Topic

Hi Thomas,

It certainly is not normal for it to squeal - I can only suggest to have another check at the alignment.
As for the oil - I put a few drops of Teflon based oil (Triflow) on the shaft and then never touch it again after that and all runs quiet.

Was the "O" ring a JetCat item or a normal "O" ring from somewhere else?

modtron
Oxford UK

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 4202 views POST REPLY
HomeTurbineAircraftHelicopterTurbine Helicopters › Jetcat PHT3-3 starter squeal
 Print TOPIC  Make Suggestion 

 8  Topic Subscribe

Tuesday, November 20 - 8:24 am - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

The RC discussion world needs to consolidate. RR is now one choice for that. Its software is cutting edge. It hosts on-topic advertising. Help RR increase traffic buy making suggestions, posting in RR's new areas (sites) and by spreading the word.

The RunRyder Difference

• Category system to allow Rep/Vendor postings.
• Classifieds with sold (hidden) category.
• Classifieds with separate view new.
• Answer PMs offsite via email reply.
• Member gallery photos with advanced scripting.
• Gallery photo viewer integrated into postings.
• Highly refined search with advanced back end.
• Hosts its own high end fast response servers.
• Hosts thousands of HD event coverage videos.
• Rewrote entire code base with latest technology.
• No off-topic (annoying) click bait advertising.
Login Here
 New Subscriptions 
 Buddies Online