blakep82
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| posted on 16/4/09 at 02:30 PM |
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welding onto a crank pulley?
is it a baaaaad idea to do it while its still attached to the engine?
I'm not thinking of welding all the way around, but say i was to weld on a trigger wheel, with say 4 welds, about 10mm in length each, would
this damage the crank shaft?
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gregs
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| posted on 16/4/09 at 02:34 PM |
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my 2p worth - in order to get a decent penetration, I had to cook the pulley with a blow lamp for 10mins before welding. That said, think it's a
bad idea anyhow.... if it can go wrong,.....
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stig2
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| posted on 16/4/09 at 02:40 PM |
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What about the balance!!
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blakep82
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| posted on 16/4/09 at 02:47 PM |
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or how else would you mount a trigger wheel? i know plenty of people have
i appreciate what you say about the balance, but there's no other way to do it
and trigger-wheels.com recommend either welding, or in the case of the RV8, bolting, with only 1 M8 bolt to stop it rotating. the balance has got to
be worse on that, surely?
[Edited on 16/4/09 by blakep82]
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don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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Benzine
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| posted on 16/4/09 at 03:04 PM |
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I welded mine to the crank pulley off the car. Where I welded it was about 30mm from any rubber. I heated up the bit I wanted to weld and kept the
rubber section of the crank submerged in a pool of water which worked great.
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clairetoo
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| posted on 16/4/09 at 03:22 PM |
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I made a billet alloy pulley , and fitted the trigger wheel with a clamp ring so timing is a simple job of loosening 4 M6 allen screws and rotating
the trigger wheel............
That way the trigger wheel runs dead true 
Its cuz I is blond , innit
Claire xx
Will weld for food......
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whitestu
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| posted on 16/4/09 at 03:35 PM |
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I welded one onto my Zetec pulley using my little Clarke Mig - no probs so far.
I did several 1" welds.
Stu
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02GF74
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| posted on 16/4/09 at 03:40 PM |
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drill it in two places opposite each other and then use roll pins.
this is my plan. (NB for crossflow pulley)
or PU it? there is no load on it, unlike the pulley, can't see why that won't work.
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blakep82
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| posted on 16/4/09 at 04:11 PM |
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thanks people 
i had thought about PU before, someone mentioned it coming off, could cause a lot of damage, but that would only happen only if its really badly out
of balance. if it was perfectly balanced it would drop straight down wouldn't it? its only if its really out of balance it might go at funny
angles.
claire, its a good idea, but well outdide my capabilities  and this engine's already too much of a nightmare. i really want someone to just
come and do my engine for me but i'll battle on
welding must be the best idea. think i'll take the pulley off too. seems the best idea. it means the engines got to come back out again though
its got to come out anyway i suppose
________________________
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don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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mcerd1
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| posted on 16/4/09 at 04:31 PM |
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it can be difficult to get a good weld and a few people have lost a triggerwheel that way - bolting/pinning is the easy option
If your worried about a single bolt affecting the ballance - use 2, 3 or 4 bolts
on an even spacing (to suit your pulley)
what ever you do it should only cost ~£20 or less to get it re-balanced if you really want to
quote:
Originally posted by clairetoo
I made a billet alloy pulley , and fitted the trigger wheel with a clamp ring so timing is a simple job of loosening 4 M6 allen screws and rotating
the trigger wheel............
That way the trigger wheel runs dead true
I did something similar (but not very locost)
http://i5.photobucket.com/albums/y170/mcerd1/Dax/IMG_4565-1.jpg
http://i5.photobucket.com/albums/y170/mcerd1/Dax/08072008059.jpg
quote:
Originally posted by whitestu
I welded one onto my Zetec pulley using my little Clarke Mig - no probs so far.
what was wrong with the one on the zetec's flywheel ?
[Edited on 16/4/09 by mcerd1]
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britishtrident
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| posted on 16/4/09 at 05:02 PM |
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Some crank pulleys are sg cast iron some are pressed steel.
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turboben
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| posted on 16/4/09 at 05:55 PM |
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I welded my first one - lasted about a year then zoomed across the road at 7000rpm one day! It was a pressed steel one and I think they flex at speed
and eventually snap next to the welds. The current one is bolted and adjustable!
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whitestu
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| posted on 19/4/09 at 09:36 AM |
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quote:
Originally posted by whitestu
I welded one onto my Zetec pulley using my little Clarke Mig - no probs so far.
--------------------------------------------------------------------------------
what was wrong with the one on the zetec's flywheel ?
The Zetec flywheel is on a shelf in the garage!
I used a CVH one as ot is much lighter than a 1.8 Zetec.
Stu
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mcerd1
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| posted on 20/4/09 at 07:24 AM |
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quote:
Originally posted by whitestu
The Zetec flywheel is on a shelf in the garage!
I used a CVH one as ot is much lighter than a 1.8 Zetec.
that explains it then
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