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B engine noise |
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TMiller/NC
Orange Level Access Joined: 11 Sep 2009 Location: Lenoir, NC Points: 1774 |
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Posted: 11 Feb 2012 at 6:55pm |
Tried to post this video some time back didn't get any responses so thought I would try again. Recently got this engine running after rebuilding (my 1st) and it has what sounded in this video like rocker arm or valve adjustment rattle. Well on examination the rocker arms were worn where they pivot on the shaft, so I made new bushings and installed which eliminated the loose motion, but still has some rattle but sounds now like it might be around the magneto area. Take a listen and give me some ideas. Thanks. Click on the pic to see the video, I think.
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bigcountry48
Orange Level Joined: 28 Aug 2011 Location: Georgia Points: 1100 |
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I don't know about the sound, but that is an interesting way you have your draw bar sitting. Any specific reason for that?
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1950 B, 1952 pulling wd, and 1954 wd45
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TMiller/NC
Orange Level Access Joined: 11 Sep 2009 Location: Lenoir, NC Points: 1774 |
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The man I bought it from said it was for some type plow, but it sure makes a handy step. I haven't had it off which will happen before painting.
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CTuckerNWIL
Orange Level Joined: 11 Sep 2009 Location: NW Illinois Points: 22818 |
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Don't know about the noise but that is how they mounted the drawbar for the Snap Couple B's. They didn't have any 39 SC B's though.
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http://www.ae-ta.com
Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF |
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Murph-NC
Orange Level Joined: 11 Sep 2009 Location: Western NC Points: 797 |
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Tim, I can't help with the noise either. But on the drawbar, the Wiard brand plows for the B used the standard drawbar mounted to the front like that. Here's a link to Rod NH's page on the plows... http://personalpages.tds.net/~thompson_wp/acb/wiards/wiards.htm
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'41 C w/Woods L503 mower, #3 mower, 2-way plows for C
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Wes (VA)
Orange Level Joined: 12 Sep 2009 Location: Elkton, VA Points: 510 |
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As you speed the engine up..what happens to the noise?
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TMiller/NC
Orange Level Access Joined: 11 Sep 2009 Location: Lenoir, NC Points: 1774 |
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Wes(VA) the noise seems more pronounced at slow idle and as the throttle is increased the exhaust becomes louder and the engine noise is not as noticeable.
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TMiller/NC
Orange Level Access Joined: 11 Sep 2009 Location: Lenoir, NC Points: 1774 |
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Maybe I should explain installed complete engine kit, (liners, pistons, rod and main bearings, cam bearings) had the crankshaft ground, and head worked at napa. |
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Wes (VA)
Orange Level Joined: 12 Sep 2009 Location: Elkton, VA Points: 510 |
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hard to tell for sure from here... you've got the valves adjusted to spec?, what about spark timing..it almost sounds like its late.
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Chalmersbob
Orange Level Joined: 11 Sep 2009 Location: Pennsylvania Points: 2122 |
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It's hard to tell where the noise is coming from without a muffler on it. I bet a muffler will quiet the noise also. If it doesn't, check your timing. Bob
Edited by Chalmersbob - 11 Feb 2012 at 10:48pm |
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BrettPhillips
Orange Level Joined: 11 Sep 2009 Location: Strasburg, VA Points: 809 |
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Tim: I agree with your thoughts that the noise is valve train related. Since you have been through the rockers and the cam bearings, there isn't much left besides the cam and the lifters. Were the cam journals worn much? My C's cam has about .002-.003 wear on the journals and it makes some noise, but it's not too bad. What did your lifters look like when you had them out? The lifter bores in the block should be checked too, since lifters that wobble in the block will make the kind of racket that you are hearing. Both of the CE engines I've rebuilt had worn lifters that needed to be refaced to restore the convex shape to the cam contact surface. My lifter bores were OK, but nothing to write home about. |
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wigtrain
Bronze Level Joined: 18 Jul 2010 Location: Maine Points: 66 |
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Pull the mag and check the impulse coupling. Sounds like the mag is running of the impulse coupling even after it starts. The impulse weights are supposed to retract after the engine starts but sometimes they stick. They'll cause a clicking sound like that.
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Jim Wiggin
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TMiller/NC
Orange Level Access Joined: 11 Sep 2009 Location: Lenoir, NC Points: 1774 |
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Thanks for the replies, it possibly could be the magneto impulse coupler as the noise seems to be louder on that side. Will check that tomorrow after work.
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BrettPhillips
Orange Level Joined: 11 Sep 2009 Location: Strasburg, VA Points: 809 |
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One more thought: How tight are the governor weight pins? That could definitely be a big part of the clatter...
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