#1
IP: 68.58.180.45
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Scavenger Tube Needed?
I rebuilt the carb on a new to me 1966 A4 today. Pic shows finished product. Was pretty straight forward rebuild. Just real cruddy inside. My question is that there was no scavenger tube on the carb. You can see the plug on the top flange and the hole at the bottom throat is simply open. My research seems to say the scav is optional and it appears the PO felt no need of one. I would add that when I cleaned her up I noticed a heavy brown color at bottom of air intake throat. Looks like might have been some pooling fuel.
What do you think and is the scavener tube a part I go to Moyer for? Thanks. |
#2
IP: 12.97.184.71
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Two for two
Same answer here as the other post...
Yes and yes. http://www.moyermarine.com/cgi-bin/s...rebuilder.html
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-Jerry 'Lone Ranger' 1978 RANGER 30 |
#3
IP: 12.97.184.71
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I should have pointed out that you want the tube because you don't want fuel pooling in the throat and leaking out that hole.
The scavenge tube reclaims and returns it to be burned. There is also a good discussion about the scavenge tube here... http://www.moyermarine.com/forums/sh...=scavenge+tube
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-Jerry 'Lone Ranger' 1978 RANGER 30 Last edited by roadnsky; 03-12-2013 at 09:31 PM. |
#4
IP: 24.125.5.216
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It looks like you have a spacer on top of your carburetor which might have been for a PCV valve. Not sure. I have a different set-up. The scavenger tube goes to the intake manifold, yes?
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#5
IP: 12.97.184.71
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Normally it does unless you have the PCV setup which his pic suggests he does.
(I'm gonna go waaaay out on a limb here and bet Neil doesn't have a drawing for that) In his case, however, he doesn't even have the tube.
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-Jerry 'Lone Ranger' 1978 RANGER 30 |
#6
IP: 24.152.131.153
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Quote:
Please note that the scavenge tube is a USCG requirement and a VERY important safety item, one of the most important.
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others Last edited by ndutton; 03-12-2013 at 10:02 PM. |
#7
IP: 68.58.180.45
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Yes I do have indigo Pcv upgrade. How does that impact the scavenger? The top plate is for the Pcv which connects on the back. The plug for the scavenge tube is on the front. Can both tunes connect to same plate? I am really curious why PO plugged the scav.
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#8
IP: 24.152.131.153
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Yes.
Quote:
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others Last edited by ndutton; 03-13-2013 at 12:34 AM. |
#9
IP: 68.56.139.11
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You might want to check for a possible air leak in the carb joint.
Put the smallest feeler gauge in between the carb halves, especially where there is that extra hole in the gasket. The newer carbs have a bolt there. We call them either 4 or 5 bolt carbs. |
#10
IP: 12.97.184.71
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Ok Neil's gonna kill me but, here are a couple of pics of where the scavenge tube connects,,,
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-Jerry 'Lone Ranger' 1978 RANGER 30 |
#11
IP: 24.152.131.153
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I think I'm gonna report that post as obscene.
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#12
IP: 68.58.180.45
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Quote:
? |
#13
IP: 76.7.135.1
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http://www.moyermarine.com/forums/showthread.php?t=7091 Post #5. Is the port in the manifold open? Is that not a normal spot for scavenge tube? Dan S/V Marian Claire
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#14
IP: 68.56.139.11
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A lot of carbs have laeked. Mine is very bad, and i use goop to seal it. Some guys machine the surfaces. (file or sand paper)
I only know of the one gasket also. I just cut off the extra, makes no difference. |
#15
IP: 68.58.180.45
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I may be able to do a test fire tomorrow and see if there is a leak. I am assuming any leak woulld require lots of choke to keep running... What kind of goop works best? :-)
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#16
IP: 63.96.228.70
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Quote:
To read more... http://www.moyermarine.com/pressure_regulation.htm
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-Jerry 'Lone Ranger' 1978 RANGER 30 |
#17
IP: 63.96.228.70
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Ok, one more.
This one's RATED "R" Neil so look away quick... You can see in this one how the scavenge tube would collect any fuel pooling in the carb throat.
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-Jerry 'Lone Ranger' 1978 RANGER 30 |
#18
IP: 68.58.180.45
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Jerry... it looks like there are two somethings connecting to the top flange in your R rated picture. I see the rear one is the scavenge tube. What is on the front? Is it possibly the pcv connection? If not let me ask this. Can I connect the scavenge tube and my pcv valve together into front and rear of the carb flange? Thanks.
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#19
IP: 63.96.228.70
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Oh Boy...
Quote:
This pic shows it a little better. (Man, Neil is never gonna speak to me again ) In my defense, I should point out that this is a very old picture...
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-Jerry 'Lone Ranger' 1978 RANGER 30 |
#20
IP: 206.125.176.5
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Yes..the right hand connection goes to Jerry's PCV valve coming out of the valve cover.
edit - shoulda refreshed Jerry - the paint is even mis-matched!
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-Shawn "Holiday" - '89 Alura 35 #109 "Twice Around" - '77 C-30, #511 with original A-4 & MMI manifold - SOLD! (no longer a two boat owner!!) |
#21
IP: 63.96.228.70
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Well, if I posted a current pic we're gonna really get into off topic territory!
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-Jerry 'Lone Ranger' 1978 RANGER 30 |
#22
IP: 24.152.131.153
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Toe-may-toe, toe-mah-toe
Upgrade, band-aid (couldn't resist, I confess I had a ghost writer on that one)
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#23
IP: 68.58.180.45
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Jerry.. The pics are very helpful. But I note the nut on your flange bolt appears crooked to me. Could not be cross-threaded? Probably not but it looks off...
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#24
IP: 63.96.228.70
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Nope. All good there, but thanks for asking...
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-Jerry 'Lone Ranger' 1978 RANGER 30 |
#25
IP: 70.193.32.60
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Hey folks. I just got rebuilt carb all buttoned down and ready for test start. Awaiting new fuel tank I had it running direct from portable can to fuel pump. Upon priming with fuel pump handle i smelled gas. Checking I found about 5 drips per minute coming out of scavenge hole in air throat. I obviously will not try start up. But is this at all normal? I have scavenge pipe on the way from MMI but still this feels like too big a leak. Could I have messed up on carb rebuild?
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