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esloan
Joined: 18 Apr 2011
Posts: 5
Location: Austin TX
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| Posted: Sat May 07, 2011 2:13 am Post subject: Need help fixing leaking tube |
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I've got an Ampro 4000g but that probably doesn't matter much for this post. Green tube was leaking coolant from the seal around the c-element. Draining the coolant was easy but getting the tube off to replace the seal is no so easy. I've worked on the seal for about 4 hours and cannot get the !@$# tube free. I cut away all the caulk and can bottom out my putty knife all the way around but it won't come loose. Anyone got tips on how to do this without breaking anything?
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Sat May 07, 2011 9:51 am Post subject: |
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This is not easy to do but it can be done. Remove the C element and you need to use a flexible blade and push it between the tube face and the LC housing. You move around the tube until you have completed a complete circuit you may not be able to cut but rather push through the silicon. You also need to do the same around the bell of the tube from the outside.
I have used a 1 inch wide piece of very thin steel to push between the tube face and the LC housing. It took about a half hour to do.
You cannot use any chemicals to remove or soften the silicon. The SD146A tubes have a cement that holds the face of the tube to the bell and this will be effected by any chemicals.
Be careful as there are 4 plastic spacers (one on each side) in the silicon they are small and easy to misplace. You will need these when putting the tube back in the LC housing.
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esloan
Joined: 18 Apr 2011
Posts: 5
Location: Austin TX
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| Posted: Sat May 07, 2011 3:19 pm Post subject: |
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Thanks for the tip. I'll give it another go.
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mc86
Joined: 20 Sep 2008
Posts: 767
Location: pittsburgh, pa
TV/Projector: ECP 4500 (Vidikron box), ECP4500+, wanting 07MS/07MTS, evaluating pc soft-blend
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| Posted: Sat May 07, 2011 5:39 pm Post subject: |
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Can one inadvertently cut through those spacers and ruin them or is it sorta obvious by feel? I've never done this, not sure if I ever will, but curious. I know the automotive windshield guys have thin, tough cutters designed to cut hard rubber; the tool also has a 90deg bend from the handle relative to the blade surface so it can be pulled through the rubber -- seems like that tool would be the thing to have.
Matt
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Sun May 08, 2011 12:14 am Post subject: |
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Well, that sucks! I had a decent green here in a 4000 housing that I threw out since no one wanted it. 
I might have a couple of other 4000 tubes. Want me to check? Shipping would be say $30 per tube to get it to you, but I'll give them away as I'll never need them.
NOt sure if they are 4000 or 4300 tubes, but I'll dig if you want me to.
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Sun May 08, 2011 12:46 am Post subject: |
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| mc86 wrote: | Can one inadvertently cut through those spacers and ruin them or is it sorta obvious by feel? I've never done this, not sure if I ever will, but curious. I know the automotive windshield guys have thin, tough cutters designed to cut hard rubber; the tool also has a 90deg bend from the handle relative to the blade surface so it can be pulled through the rubber -- seems like that tool would be the thing to have.
Matt |
It looks like Ampro went all out with the spacers. They look like a small plastic washer about 1mm thick that has been cut in half so if you destroy them you can easily replace them. 
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esloan
Joined: 18 Apr 2011
Posts: 5
Location: Austin TX
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| Posted: Sun May 08, 2011 1:31 pm Post subject: |
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Thanks Curt. Let me see if my seal holds and I'll let you know.
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