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Matthew Balkwell
Advanced Member
Username: matt
Post Number: 41
Registered: 04-2006
| | Posted on Thursday, April 24, 2008 - 01:45 am: | 
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Well, today we tried a few things to track down the mysterious noise from our P55.
I started by running exhaust straight through and not going through the muffler, no change in noise.
Took water pump off and ran engine with water being gravity fed through engine, again no change in noise.
I got my dad to push a piece of nylon bread board against chain to increase tension in drive chain again no change in noise.
I changed magnetos as impulse mechanism on original maggy put quite a pulse in chain, again no change in noise.
Besides a really shot bearing or the bottom section of a connecting rod hanging off i am at my wits end to explain the noise, i must admit the engine starts and performs very well, but i just want to fix what ever it is that is making the noise.
Our other older P55 on a trolley in the shed is very quiet and does not make any internal noises at all.
Has anyone got any suggestions besides ignoring the noise?.
Matt and Ron |
John Archibald
Senior Member
Username: john_archibald
Post Number: 58
Registered: 08-2006
| | Posted on Thursday, April 24, 2008 - 07:50 pm: |
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Matt & Ron,
I haven't been following this very closely, but my 1930 Model A Ford Coupe's engine will knock if I have the timing off too far. The advance / retard lever is mounted in the car on the steering column and can be changed on the fly.
Your knocking could be caused by poor ignition timing.
Might be worth checking.
Archibald
Northfield, Minnesota
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Matthew Balkwell
Advanced Member
Username: matt
Post Number: 43
Registered: 04-2006
| | Posted on Friday, April 25, 2008 - 06:38 am: |
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John thanks for your advice , i will have a look at the timing tomorrow, it just might be the cure as this engine is that easy to start,and runs a bit warm.
Matt and Ron. |
Malcolm Russell Ward
Member
Username: russell
Post Number: 21
Registered: 08-2003
| | Posted on Friday, April 25, 2008 - 11:42 am: |
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Matthew, sorry I've not been following the discussion closely. Just a thought. Have you checked that the crankshaft is not fretting somewhere. You will know that it is built up rather like a motorcycle's. I would imagine that there would be a nasty deep bearing sort of knock if it was. You might be able to lock the aft coupling and see if there is any movement at the flywheel. Wouldn't be much. I remember when my old man had a new one it ran a main bearing and it was a light knock. |
Matthew Balkwell
Advanced Member
Username: matt
Post Number: 46
Registered: 04-2006
| | Posted on Saturday, May 10, 2008 - 05:03 am: |
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Malcom, everything seems tight as a nut[to coin a phrase} the annoying sound sometimes dissapears at certain revs and comes back with a vengeance at others.
We are going to soundproof the engine box and then pretend the noise does not exist, pretty up our no2 engine and probably put it in at some stage during he winter, thanks for your advice, if you see any NZ kauri going cheap give me a yell.
Matt. |
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