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Post by 1924vette on Mar 10, 2009 16:24:42 GMT -5
I was looking in my Chevette manual and saw a plug at the back end of the camshaft in a picture. What does this plug do? I just installed a new Melling camshaft, but did not see a plug when I removed the old cam.
Mike
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Post by hydroli on Mar 10, 2009 16:37:20 GMT -5
I had the exact same problem with an aftermarket cam, no plug! The plug holds oil presure within the cam. Because of this I was having low presure and valve train noises, just like you were experiencing. I broke my bottom end..
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Post by 1924vette on Mar 10, 2009 17:11:56 GMT -5
That might be what I need. I did not see a plug in the end of the original cam and did not get one with the new cam. If that turns out to be the problem, does anyone know who sells the plugs? Also, what holds the plug into the end of the camshaft?
Mike
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Post by hydroli on Mar 10, 2009 17:27:28 GMT -5
I think it's only press fit. When you get one, it would be a good idea to weld it just to be sure. That's what I'll do next time.
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Post by 1924vette on Mar 10, 2009 17:32:39 GMT -5
I will give Melling's tech line a call tomorrow and see what they say.
Thanks
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Post by hydroli on Mar 10, 2009 17:57:13 GMT -5
You're welcome
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Post by 1924vette on Mar 10, 2009 21:54:20 GMT -5
Well, it's not the plug. I checked the new cam and it is plugged. I believe I might have defective lifters. I pulled the valve covers off and don't like the looks of them. They are new and they are not staying pumped up. I'm going to put my old lifters back in tomorrow night and see what happens. I have modified the oil pump bypass to run over 40psi and still get the noise. It's hard to find a problem with so many new parts, and you don't suspect the new ones to be causing trouble.
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Post by zackbandyr12 on Mar 10, 2009 22:01:23 GMT -5
U dont have any oil restrictions in the block or head do u?? Well prob not since is in street use.
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Post by sobeit on Mar 10, 2009 22:41:01 GMT -5
whats this mod you guy talk about alot?
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Post by hydroli on Mar 11, 2009 7:15:11 GMT -5
He's trying to solve a oil presure / valve train noise problem. We are trying to help. The modification is in the oil pump, where there's a spring that regulate oil presure. The spring being stiffer means oil presure will be higher. It's not a cure in itself for a high reving chevette engine, should I warn..
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Post by 1924vette on Mar 12, 2009 10:05:20 GMT -5
Last night I took the new lifters out and put the old ones back in. It is 90% better. I borrowed a K-D 3087 valve spring compressor. It made the job easy. I still have a little noise. I have ordered a new fuel pump with pushrod. I'll see how it does after that. Right now, it's good enough to drive on the street. I have another engine coming in a trade deal. I'll probably rebuild that engine and swap them out when done. After pushing the oil pump bypass spring plug in about 1/8", it's running at 42psi oil pressure. The lifters that came from Melling were not like the originals. My old lifters had a plug at the hole in the top of them. The new ones had the hole, but no plug. I don't know it that made the difference, but they were not staying pumped up.
Mike
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Post by sobeit on Mar 12, 2009 18:23:05 GMT -5
y dont ya get solid lifters?
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Post by 1924vette on Mar 13, 2009 16:18:02 GMT -5
Sobeit,
Solid lifters sounds like a good idea. I might end up doing that.
Thank you
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