PHF 36 O-ring identification

Yogi

Yogi

Hero member
Location
Bellingen NSW Australia
Could someone please let me know which O-ring goes where in a PHF 36 carburettor?  The carb I have pulled down was missing most of these, and the diagram I have does not seem to help.

The kit I am using is a Dell?Orto 52547.77.

Many thanks for the forum?s help.

Yogi
 

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One for the choke jet (inside the float bowl), one for the choke plunger housing (that screws into the top of the carby with the cable adjuster in it), one for the pilot mixture screw (spring, then washer, then o-ring inwards), idle speed screw (similar setup to pilot mixture screw?), float bowl, top cover. All from memory, so could be wrong ...
 
Also one for the acc. pump adjusting screw (tiny green one) and acc. pump non-return valve, both are often/usually forgotten.

The gasket kits often cater for more than one version of a certain carb, quite usual to have a couple of left overs.

piet
 
sfcpiet said:
Also one for the acc. pump adjusting screw (tiny green one) and acc. pump non-return valve, both are often/usually forgotten.

The gasket kits often cater for more than one version of a certain carb, quite usual to have a couple of left overs.

piet
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Piet, I'm not seeing where the non-return valve has/uses a seal? There's no obvious seat for an O-ring, and the square base of the valve would cut an O-ring. Is it supposed to use a gasket? And if so, there's nothing in the kit that fits. As near as I could tell all seals/gaskets present and accounted for. The only thing I thought missing in the kit was a second felt wicking seal for the piston crank arm. The outer carbs are capped at one end, but the center readily accessible at both ends. Anyway, no seals or gaskets were fitted to the non-return on any of the three carbs on my RGS, which of course means nothing; I know someone's been in there before.
 

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There's an o ring in the brass fitting on the actual accelerator pump body at the top of the carbs.
 
murphus said:
Piet, I'm not seeing where the non-return valve has/uses a seal? There's no obvious seat for an O-ring, and the square base of the valve would cut an O-ring. Is it supposed to use a gasket? And if so, there's nothing in the kit that fits. As near as I could tell all seals/gaskets present and accounted for. The only thing I thought missing in the kit was a second felt wicking seal for the piston crank arm. The outer carbs are capped at one end, but the center readily accessible at both ends. Anyway, no seals or gaskets were fitted to the non-return on any of the three carbs on my RGS, which of course means nothing; I know someone's been in there before.
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The kits are meant for Guzzi carbs.  They have the crank as well, but capped at one end, just like the Laverda outers.  You will need to source a 4th felt seal from your Dellorto dealer, they are available seperately.

See Grants answer, there is another valve in the acc. pump diaphragm housing.  The valve accepts an o-ring.  I usually replace both valves anyway, mucking around for hours with acc. pumps that refuse to start working really pisses me off.

piet
 
I wonder about the felt. I noticed the kits said "Guzzi" on the label and had meant to look at a Guzzi to see if that was the case. I managed to save one of the felts, but I'll likely go ahead and get another new one. The valve in the acc. pump housing does what? As you can tell, first time into DellOrtos so no experience to work from and the insights are great.
Richard
 
Many thanks to you all for your answers, and to Brett for the diagram.  I have the same diagram, but in English.

Carbs back together and on the bike - now to try adjusting with Carbtune gauges.

Main jets are 145, pilots are 65.  Needles at 2nd notch down.

Redax rebuilt standard engine running standard exhaust with balance pipe and 60mm Dellorto trumpets, but will look for pod filters to suit in time.

Seems to start fine without choke, which makes me wonder if 65 is too rich?

Yogi
 
Yogi from reading here yes and yes. Mains seem to be around 118 to 125 and idle 55.But its best to do a dino run to be sure.
Thats for tripals, is this your black bike or the road twin?
 
Yogi said:
Many thanks to you all for your answers, and to Brett for the diagram.  I have the same diagram, but in English.

Carbs back together and on the bike - now to try adjusting with Carbtune gauges.

Main jets are 145, pilots are 65.  Needles at 2nd notch down.

Redax rebuilt standard engine running standard exhaust with balance pipe and 60mm Dellorto trumpets, but will look for pod filters to suit in time.

Seems to start fine without choke, which makes me wonder if 65 is too rich?

Yogi
Click to expand...

I presume we're talking big valve SF?

As standard, 140 mains, 60 pilots.

Paul
 
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