'82 G1 not getting gas

kcnaz · 01-22-2011, 10:46 PM

Doing good work man..

Do you remember what the little outlet nipple in your picture was hooked up to?
Mine was disconnected and venting out over the back of the engine compartment.

ky_mike · 01-23-2011, 01:25 AM

This is a great thread. Make me want to tear mine apart

happilymaad · 01-23-2011, 06:13 AM

Thanks.

Not sure what it is called, but it is a black plastic rectangular box that says Yamaha. This box connects to the intake joint behind the carb. and is held in place by 2 bolts (one on each side). It is bolted to the plastic engine cover.

kcnaz · 01-23-2011, 03:35 PM

Quote:

Originally Posted by happilymaad

Thanks.

Not sure what it is called, but it is a black plastic rectangular box that says Yamaha. This box connects to the intake joint behind the carb. and is held in place by 2 bolts (one on each side). It is bolted to the plastic engine cover.

Anyone have a clue? Crank breather?
Thanks for the info HM.

Maybe as you put it back together you can snap a pic for me. Thanks .KC

happilymaad · 01-23-2011, 03:47 PM

Found it on trgolfcar.com. They are calling it a vac control valve. I'm interested to find out what its purpose is.

No problem on the pics, kc. Probably will be about a week before I get parts and time.

kcnaz · 01-24-2011, 10:09 AM

Thanks for the info HM.

Found this drawing this morning. Not stealing your thread, just trying to learn. Looks like an emission control device. The vacuum control valve 37 may act like a ( PCV (Positive Crankcase Ventilation) valve and air chamber 36 may be to collect gas/oil mixture excess and return it to the combustion chamber/crankcase rather than dripping/spraying it on the greens(golf term).

I guess we both need some help with "do we really need part 36 on our carts?"

DOOmsman · 01-24-2011, 10:40 AM

It is a form of boost bottle to smooth
the air intake pulses at low RPM.
Read here.
http://datafan.com/articles/boostbottle.html

happilymaad · 01-24-2011, 11:38 AM

Good question, KC. Since this is my first gas golf cart and engine rebuild, I was planning on putting it back on just to keep it stock-ish. After reading the link from DOOmsman, its definetly going back on. :)

Thanks, DOOmsman. I beleive that answers the question of what it does and do we need it.

When I begin to reassemble, does the crankshaft and / or the crank case need to be greased or oiled? If so, how much?

I appreciate the help and encouragement! This is a great forum.

kcnaz · 01-24-2011, 11:54 AM

Thanks, DOOmsman.

Great reading.
I agree HM, great forum!

GMB74 · 01-24-2011, 09:03 PM

When reassembling, anything that moves should be liberally lubed. All the bearings, the cylinder and piston. This prevents running dry and damaging your new parts on startup. I typically use the same 2-stroke oil you put in the lube tank, put it in a squirt can, and if it moves, shoot it. The crankcase sealing surface needs to be cleaned and kept clean and oil- free. The mating surfaces should be coated with Threebond/Yamabond/Hondabond/Permatex Motoseal (all the same product- a grey, semi-drying zero-clearance sealer).
Regarding your cylinder, it looks like you need at least a new piston and rings. If you are going to do that, it would be best to have the cylinder bored oversize. That way you have essentially a new engine when you are done.

01-22-2011, 10:46 PM	#21
kcnaz Gone Wild Join Date: Apr 2010 Location: Southern Arizona Posts: 287	Re: '82 G1 not getting gas Doing good work man.. Do you remember what the little outlet nipple in your picture was hooked up to? Mine was disconnected and venting out over the back of the engine compartment.

01-23-2011, 01:25 AM	#22
ky_mike Gone Wild Join Date: Aug 2010 Location: Kentucky Posts: 207	Re: '82 G1 not getting gas This is a great thread. Make me want to tear mine apart

01-23-2011, 06:13 AM	#23
happilymaad Not Yet Wild Join Date: Jul 2008 Posts: 25	Re: '82 G1 not getting gas Thanks. Not sure what it is called, but it is a black plastic rectangular box that says Yamaha. This box connects to the intake joint behind the carb. and is held in place by 2 bolts (one on each side). It is bolted to the plastic engine cover.
happilymaad Not Yet Wild Join Date: Jul 2008 Posts: 25

01-23-2011, 03:47 PM	#25
happilymaad Not Yet Wild Join Date: Jul 2008 Posts: 25	Re: '82 G1 not getting gas Found it on trgolfcar.com. They are calling it a vac control valve. I'm interested to find out what its purpose is. No problem on the pics, kc. Probably will be about a week before I get parts and time.
happilymaad Not Yet Wild Join Date: Jul 2008 Posts: 25

01-24-2011, 10:09 AM	#26
kcnaz Gone Wild Join Date: Apr 2010 Location: Southern Arizona Posts: 287	Re: '82 G1 not getting gas Thanks for the info HM. Found this drawing this morning. Not stealing your thread, just trying to learn. Looks like an emission control device. The vacuum control valve 37 may act like a ( PCV (Positive Crankcase Ventilation) valve and air chamber 36 may be to collect gas/oil mixture excess and return it to the combustion chamber/crankcase rather than dripping/spraying it on the greens(golf term). I guess we both need some help with "do we really need part 36 on our carts?"

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01-24-2011, 10:40 AM	#27
DOOmsman Gone Wild Join Date: Jul 2008 Location: Reddick IL Posts: 11,220	Re: '82 G1 not getting gas It is a form of boost bottle to smooth the air intake pulses at low RPM. Read here. http://datafan.com/articles/boostbottle.html

01-24-2011, 11:38 AM	#28
happilymaad Not Yet Wild Join Date: Jul 2008 Posts: 25	Re: '82 G1 not getting gas Good question, KC. Since this is my first gas golf cart and engine rebuild, I was planning on putting it back on just to keep it stock-ish. After reading the link from DOOmsman, its definetly going back on. :) Thanks, DOOmsman. I beleive that answers the question of what it does and do we need it. When I begin to reassemble, does the crankshaft and / or the crank case need to be greased or oiled? If so, how much? I appreciate the help and encouragement! This is a great forum.
happilymaad Not Yet Wild Join Date: Jul 2008 Posts: 25

01-24-2011, 11:54 AM	#29
kcnaz Gone Wild Join Date: Apr 2010 Location: Southern Arizona Posts: 287	Re: '82 G1 not getting gas Thanks, DOOmsman. Great reading. I agree HM, great forum!

01-24-2011, 09:03 PM	#30
GMB74 Gone Wild Join Date: Jun 2009 Location: Heluvabump,VT Posts: 623	Re: '82 G1 not getting gas When reassembling, anything that moves should be liberally lubed. All the bearings, the cylinder and piston. This prevents running dry and damaging your new parts on startup. I typically use the same 2-stroke oil you put in the lube tank, put it in a squirt can, and if it moves, shoot it. The crankcase sealing surface needs to be cleaned and kept clean and oil- free. The mating surfaces should be coated with Threebond/Yamabond/Hondabond/Permatex Motoseal (all the same product- a grey, semi-drying zero-clearance sealer). Regarding your cylinder, it looks like you need at least a new piston and rings. If you are going to do that, it would be best to have the cylinder bored oversize. That way you have essentially a new engine when you are done.