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VWinTHEblood Samba Member
Joined: December 28, 2005 Posts: 53
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Posted: Sun Sep 20, 2009 5:16 pm Post subject: rebuilt engine, turns over very slowly |
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I recently finished my engine rebuild on my 1970 deluxe, 1600 single port. When I try to fire it up it turns over really slowly. I have a new battery and starter and I cleaned all the corrosion off the connections to the starter and battery. I can't seem to get the engine to turn over fast enough even when it's connected to a running vehicle for a jump start. I noticed that the main transmission ground strap is broken in half, could this be causing the problem? The only other thing I think could be the problem is with the wiring from the ignition switch to the starter solenoid. I can't inspect much of the wiring because it runs under the belly pan of the bus. Any thoughts appreciated. Thanks. |
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Daverham Samba Member
Joined: August 27, 2009 Posts: 1397 Location: USA
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Posted: Sun Sep 20, 2009 5:20 pm Post subject: |
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How does it feel when you turn it over by hand? Are we talking about awesome compression, misaligned bearings or an electrical/starter problem? |
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busdaddy Samba Member
Joined: February 12, 2004 Posts: 51155 Location: Surrey B.C. Canada, but thinking of Ukraine
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Posted: Sun Sep 20, 2009 5:24 pm Post subject: |
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Fix that ground strap, the clutch cable is not meant to be a ground path.
As stated, how does it feel? _________________ Rust NEVER sleeps and stock never goes out of style.
Please don't PM technical questions, ask your problem in public so everyone can play along. If you think it's too stupid post it here
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Слава Україні! |
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Desertbusman Samba Member
Joined: June 03, 2005 Posts: 14655 Location: Arizona
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Posted: Sun Sep 20, 2009 5:32 pm Post subject: Re: rebuilt engine, turns over very slowly |
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VWinTHEblood wrote: |
I noticed that the main transmission ground strap is broken in half, could this be causing the problem? . |
Think about it. The starter requires a lot of juice. So there is the big positive cable from the battery straight to the starter. Where is the big qround cable from the starter back to the battery? It has to be able to complete the circuit. That ground strap that is broken plus all the bolted connectiions between the starter and trans, trans to frame via the ground strap, and then the frame to the battery with the battery ground cable.
If the starter is turning at all now without the trans ground cable the power is going thru all the lessor metal to metal contacts such as clutch and throttle cables, maybe the axle shafts, and wherever else.
Get a new ground strap on the trans. _________________ 71 Superbug
71 Westy |
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VWinTHEblood Samba Member
Joined: December 28, 2005 Posts: 53
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Posted: Mon Sep 21, 2009 4:21 pm Post subject: |
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The engine turns over perfectly, all the main bearings are seated correctly. Someone told me that a worn starter bushing may be causing the problem? |
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Sawsalesman Samba Member
Joined: May 27, 2009 Posts: 796 Location: Ashland, NH
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Posted: Mon Sep 21, 2009 4:30 pm Post subject: |
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Try fixing the strap first. |
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TomWesty Samba Member
Joined: November 23, 2007 Posts: 3482 Location: Wyoming,USA
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Posted: Mon Sep 21, 2009 4:44 pm Post subject: |
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All that stuff probably worked okay when you had an engine with weak compression and loose bearings. Now it needs more current to the starter to turn it over because you have a much tighter engine. The strap completes the path for that current. Replace the strap first. |
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VWinTHEblood Samba Member
Joined: December 28, 2005 Posts: 53
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Posted: Mon Sep 21, 2009 8:52 pm Post subject: |
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Okay thanks everyone, I ordered a new ground strap today. Ill post when I get it installed and see if it was the problem. |
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iratehippie Samba Member
Joined: April 21, 2002 Posts: 401 Location: high on southern oregon mountaintop...
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Posted: Tue Sep 22, 2009 9:12 am Post subject: |
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If you have some good jumper cables you could try and use them as grounding wire, trans. to frame, see if that makes a difference. |
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a-marshal Samba Member
Joined: March 21, 2009 Posts: 270 Location: Toronto
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Posted: Tue Sep 22, 2009 11:09 am Post subject: |
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or use the jumper cable from the negative pole of the battery direct to the tranny case.. |
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VWinTHEblood Samba Member
Joined: December 28, 2005 Posts: 53
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Posted: Tue Sep 29, 2009 1:57 pm Post subject: |
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I fixed the ground strap which corrected the slow starter motor so I was then able to start the rebuilt engine for the first time. I am now trying to work out some kinks in the fuel system to get the engine to run properly at idle. Thanks for everyone's help. |
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aeromech Samba Member
Joined: January 24, 2006 Posts: 16971 Location: San Diego, California
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Posted: Tue Sep 29, 2009 2:23 pm Post subject: |
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another samba success story _________________ Lead Mechanic: San Diego Air and Space Museum
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