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GREASE MONKIE
Samba Member
Joined: September 14, 2014
Posts: 18
Location: Los Angeles
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 Posted: Fri Jul 29, 2016 11:22 am Post subject: Noise Issue - Need Help |
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Having an issue with my '63 bug. In the mid to higher rpms the exhaust is making a strange noise. The closest thing it reminds me to is a Subaru with unequal headers. It is a stock 40 hp engine with the stock muffler and peas hooters. Just wondering what it could be. I appreciate any help. Thanks.
Last edited by GREASE MONKIE on Fri Jul 29, 2016 6:00 pm; edited 1 time in total |
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sludge20
Samba Member
Joined: May 30, 2016
Posts: 22
Location: Bellvue, Nebraska
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| Posted: Fri Jul 29, 2016 12:40 pm Post subject: Re: Exhaust Issue- NEED HELP |
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What does the noise sound like? Is it backfiring? Rattling? To troubleshoot it, you need to provide more information!
Just a few suggestions:
The first thing I would check is all the connections and seals for the exhaust (manifolds, intake manifolds, etc.). I would also take a look at the seals on the heater boxes/j pipes.
Take a good look at the intake manifold seals too.
Check your vale settings and timing.
How is your carb health? |
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bugheadred
Samba Member
Joined: January 23, 2003
Posts: 666
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| Posted: Fri Jul 29, 2016 1:11 pm Post subject: Re: Exhaust Issue- NEED HELP |
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| and see if the heads are loose it makes a strange noise sounds like leaking muffler |
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planenut
Samba Member
Joined: April 12, 2012
Posts: 334
Location: Georgia
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| Posted: Fri Jul 29, 2016 5:05 pm Post subject: Re: Exhaust Issue- NEED HELP |
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| The tubes inside a muffler can break loose and make a funny noise. Also, the guts inside the tailpipes can get loose and sound funny. |
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GREASE MONKIE
Samba Member
Joined: September 14, 2014
Posts: 18
Location: Los Angeles
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| Posted: Fri Jul 29, 2016 5:59 pm Post subject: Re: Exhaust Issue- NEED HELP |
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| So I recently took the engine out because I had clogged heat risers and when I was putting it back together after unclogging it, I put all new seals and clamps for the muffler. The noise was not made until I was running it one day and my firewall insulation covered my fan and the car overheated and burned my spark plug wires. The sound it makes sounds like a rumble and it's only when I accelerate. So far I have: new points, adjusted timing, new spark plug wires, new spark plugs, adjusted valves, adjusted carb. |
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bugheadred
Samba Member
Joined: January 23, 2003
Posts: 666
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| Posted: Fri Jul 29, 2016 6:11 pm Post subject: Re: NOISE ISSUE- NEED HELP |
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| ill bet the heads are loose |
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GREASE MONKIE
Samba Member
Joined: September 14, 2014
Posts: 18
Location: Los Angeles
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| Posted: Fri Jul 29, 2016 6:36 pm Post subject: Re: NOISE ISSUE- NEED HELP |
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| What are the symptoms of loose heads? |
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67rustavenger 
Samba Member
Joined: February 24, 2015
Posts: 9772
Location: Oregon
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| Posted: Fri Jul 29, 2016 6:48 pm Post subject: Re: NOISE ISSUE- NEED HELP |
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| GREASE MONKIE wrote: |
| What are the symptoms of loose heads? |
Kind of a fut fut fut sound at idle. Then it gets more pronounced upon acceleration. A blocked cooling fan inlet is a very bad thing. Not to mention the burned spark plug wires. That means things may have gotten very hot in the engine compartment.
Go out to your car and see if you can push pull the rear crankshaft pulley front to back. If there is more that a very slight (meaning 1/64th of an inch) movement. Your gonna need to investigate further.
Good Luck.
_________________
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GREASE MONKIE
Samba Member
Joined: September 14, 2014
Posts: 18
Location: Los Angeles
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| Posted: Fri Jul 29, 2016 6:55 pm Post subject: Re: NOISE ISSUE- NEED HELP |
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| I actually noticed I started to leak a little bit of oil before it didn't leak one drop. |
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TinCanFab
Samba Member
Joined: April 04, 2006
Posts: 2743
Location: Waterford, California
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GREASE MONKIE
Samba Member
Joined: September 14, 2014
Posts: 18
Location: Los Angeles
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| Posted: Fri Jul 29, 2016 7:14 pm Post subject: Re: NOISE ISSUE- NEED HELP |
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| Alright I will look into that. I'm going to do a compression test tomorrow see how it does if the compression is good I'm going to tighten the heads of not just rebuild it. Thanks. |
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sludge20
Samba Member
Joined: May 30, 2016
Posts: 22
Location: Bellvue, Nebraska
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| Posted: Thu Aug 04, 2016 9:26 am Post subject: Re: Noise Issue - Need Help |
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| Take a good look at the fan itself too. A bad bearing can create that sort of sound when the fan rubs intermittently on the shroud. |
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