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990 Davud Brown


 
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Tom N MS
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PostPosted: Wed May 23, 2007 5:08 pm    Post subject: 990 Davud Brown Reply to specific post Reply with quote

Seems that all D Browns will soon be in the scrap pile. Parts are near extinct. Spent(off and on) 2 hours on the phone today trying to locate a crankshaft for a 990 AD4/47A..Prefer new but looks like I must settle for a reground one if I plan for it to ever run again. Reground DB cranks are weak and have a tendency to break like my last one did.

 
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SteveKy
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PostPosted: Thu May 24, 2007 6:10 pm    Post subject: Re: 990 Davud Brown Reply to specific post Reply with quote

Tom if you can't find a new crank ,you can have one custom made .It's not cheap but what is? GOOD LUCK,Steve

 
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richard in nz
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PostPosted: Thu May 24, 2007 9:14 pm    Post subject: Re: 990 Davud Brown Reply to specific post Reply with quote

You should not have trouble in a 990 PROVIDED the crank grinder maintains the correct fillit radius when grinding, a lot of them will skimp this as they have to reshape the grinding wheel to do it and it saves them a lot of time and cost. If memory serves me correctly the max grind recommended is 0.010" for Diesels but you can grind further and use the crank in a petrol or kerosene engine. I have been caught out like this before with a less than good machine shop, and I have had cranks ground down to 0.030" U/S with no reliability problems when done correctly. Make shure the fillit radius is maintained by your machine shop.

 
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Tom N MS
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PostPosted: Fri May 25, 2007 2:17 am    Post subject: Re: 990 Davud Brown Reply to specific post Reply with quote

Thanks. The crank that broke had been turned .040 and had run several years. Not a tremendous amount of running but some of it was ridiculous abuse. After Katrina he pulled huge, whole trees, walking on the rear wheels all the time, dogging it every minute. With sensible, normal use I would have no concern, especially one turned .010.
Thanks again

 
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Tom N MS
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PostPosted: Fri May 25, 2007 2:18 am    Post subject: Re: 990 Davud Brown Reply to specific post Reply with quote

I can only imagine how expensive that would be. Good old tractors but not that good to me.JMHO

 
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Greg Cigana
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PostPosted: Sat May 26, 2007 3:18 pm    Post subject: Re: 990 Davud Brown Reply to specific post Reply with quote

Hi All
Check at Bareco (google it) they have new crankshafts and have an outlet in the USA

Cheers from sunny Australia....

 

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Tom N MS
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PostPosted: Sat May 26, 2007 5:24 pm    Post subject: Re: 990 Davud Brown Reply to specific post Reply with quote

Thanks. I wll check with them.

 
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Greg Cigana
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PostPosted: Tue Jun 05, 2007 12:41 am    Post subject: Re: 990 Davud Brown Reply to specific post Reply with quote

Hi Tom,

I checked the Bareco Catalog and they do have crankshafts for the 100mm bore not the 92mm bore that your 990 might have. Your engine type would inficate a pre 1968 model 990 Implematic.

Sorry

Greg


 

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Tom N MS
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PostPosted: Tue Jun 05, 2007 3:14 am    Post subject: Re: 990 Davud Brown Reply to specific post Reply with quote

Thanks..got lucky and found a new one mot too far from where I live.

 
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