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Post by bob123456789 on Jan 29, 2017 11:48:12 GMT -5
Hi there.
Once again I could use the help of the good people here who have more experience than I do.
I have a Linhai 257cc.
I replaced my head with a new one. Most of the work has been done. However there is one thing I need help with. The head is aluminum. There is a brass nipple for a vacuum line that needs to be removed from the old one and put in the new one. I can't see how to get it out. Below are pictures of the old one and the new one. It is stuck in the head. Both the aluminum head and the brass nipple are very soft and easy to damage. I have tried a vise grip after letting WD40 sit overnight. All I succeeded in doing was scratching up the brass nipple.
1) How do I get the old nipple out without damaging anything? 2) Can I buy a new nipple somewhere?
The nipple is right beside the temperature sensor right beside the intake manifold. It looks like it is just pressed into the head. The head is already on the engine. The vacuum line looks like it connects to a vacuum operated cooling valve on the head.
Thanks for your help. |
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Post by bob123456789 on Feb 4, 2017 14:45:05 GMT -5
I have not been able to get this removed. I have tried cleaning it off with gas. Then I let it soak overnight using Liquid Wrench. Then using a needle nose vise grip it wouldn't budge. I then tried applying heat to the head . It still wouldn't budge. The vise grips did damage the brass nipple a bit when I tried this.
1) How do I get this loose? I don't want to damage the nipple or
2) Where can I buy a new one?
As best I can measure it the brass nipple dimensions are:
Inside Diameter 0.1 inch
Outside diameter 0.2 inches.
The length of the nipple outside of the head is 0.56 inches. There is more inside the head.
Thanks for your help with this.
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Post by 4950cycle on Feb 4, 2017 16:20:03 GMT -5
JCL MP250A Lihai 257cc powered / Sorry I have no answer for you. All the ones I've ever switched were on carburetors. I would just do what you have tried already. Twisted them out with vise grips . Try this, Find a nail or small bolt that fills the hole in the brass fitting. This will keep the brass fitting from collapsing while you really get a tight grip on that mother with a good visegrip again . Then try to twist it out again with vigor with no fear of collapsing it . Then if you still can't get it out without twisting it in two, Heat the head up with a burnzomatic and repeat. Doesn't matter much if you damage the aluminum head with heat because its crap already. Sometimes you have to do this 2 or more cycles to break a stubborn or rusted bolt loose. If it's gonna come out this will get it.
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Post by bob123456789 on Feb 4, 2017 17:48:27 GMT -5
4950cycle. I appreciate the good advice. I like your idea of putting a small bolt or nail inside the brass nipple so it doesn't crush. I really don't want to damage it if isn't something I can't buy.
Do you (or does anyone) know where I can buy a new one and then just leave the stuck one in the old head?
Does anyone else have any ideas to get this out?
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Post by spandi on Feb 4, 2017 18:40:09 GMT -5
You might just want to give the folks at Sunright a call. (Official distributor of Linhai parts) 1-877-515-7948 (www.sunright.net) Hope this helps.
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Post by spandi on Feb 4, 2017 18:46:28 GMT -5
You might want to give the folks at Sunright a call. (Official Linhai parts distributor) 1-877-515-
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Post by bob123456789 on Feb 4, 2017 20:56:07 GMT -5
Sandi. I checked with Sunright this week and they don't have the brass nipple.
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Post by spandi on Feb 5, 2017 11:26:15 GMT -5
Sandi. I checked with Sunright this week and they don't have the brass nipple. Dang, I thought I had it...Rats! ( I think that brass fitting is pushed in under pressure at the factory and isn't supposed to be removed.) I'm thinking maybe you could have a piece of tubing cut to size and shape, then brazed on? |
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Post by rockynv on Feb 6, 2017 5:08:22 GMT -5
You can usually find a correct size generic brass fitting with the barb/bulb end on it at most of the better auto parts stores or the brass fitting section of the plumbing isle at Lowes, Home Depot, ACE, etc. You can then thread the head to accept it or cut off the threads and press it in.
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Post by bob123456789 on Feb 6, 2017 11:14:05 GMT -5
I was stopping by to say thanks to rockynv. I just heard back from my new friends at Parts for Scooters who rockynv had pointed me to earlier. They have it in stock and I just ordered several. It is here: www.partsforscooters.com/122-83-VOG-260-Small-Pipe-JointI was so glad to find it. Now, how to put in on? I hope it isn't a tight pressed on at the factory like spandi mentioned. The head is already back on and I would hate to pull it off again or damage anything banging it in. Any advice on this? |
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Post by spandi on Feb 7, 2017 11:31:26 GMT -5
I was stopping by to say thanks to rockynv. I just heard back from my new friends at Parts for Scooters who rockynv had pointed me to earlier. They have it in stock and I just ordered several. It is here: www.partsforscooters.com/122-83-VOG-260-Small-Pipe-JointI was so glad to find it. Now, how to put in on? I hope it isn't a tight pressed on at the factory like spandi mentioned. The head is already back on and I would hate to pull it off again or damage anything banging it in. Any advice on this? If they sell it commercially more than likely you can install it. I'd use a hammer or punch in brass so as not to damage anything. (Good call on Rocky's part.) |
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Post by bob123456789 on Feb 18, 2017 20:26:32 GMT -5
The nipple came from Parts for Scooters and I installed it. I am working on putting the rest of the engine back together.
I decided to test the fuel pump and see how it is working. When I removed the fuel line between the fuel pump and the carb and turned it over the fuel is not very strong. I don't know if this is normal or if I have low vacuum or a bad pump.
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Post by dollartwentyfive on Feb 18, 2017 22:15:02 GMT -5
why try to remove the old one?
i'm sure if you shopped around that you could find something that fits the new head.
don't forget such places as plumbing supply stores, they just might have what you need.
old dehumidifiers might have the right sized tubing.
if you can't get a press fit, then you will need a little JB weld
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Post by dollartwentyfive on Feb 18, 2017 22:30:10 GMT -5
The nipple came from Parts for Scooters and I installed it. I am working on putting the rest of the engine back together. I decided to test the fuel pump and see how it is working. When I removed the fuel line between the fuel pump and the carb and turned it over the fuel is not very strong. I don't know if this is normal or if I have low vacuum or a bad pump. i don't know if the 257 has the pump or the valve, but if it uses vacuum, then you should know that manifold vacuum is very low at high speeds. my 244 had the valve, and it was completely worthless at high speeds. some have used an electric pump and said they had good results. if your gas tank outlet is 6 vertical inches above the carb inlet, then you can use a direct feed, but you will need a manual shutoff valve. NAPA sells a briggs and stratton valve that will work. be aware that forgetting to shut off the fuel can have bad effects. a sticky carb float with an open intake valve, and you can be greeted with an engine full of gas. |
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