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WH D160 carb help


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#1 coldone OFFLINE  

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Posted June 05, 2011 - 06:52 AM

The carb on the WH D160 is killing me. The engine is an Onan BF and the carb is the Marvel S DD13. I have pulled it apart and cleaned it well, rodded all the passages and flushed with carb cleaner. When i put back together and set it like the manual says, it will not run without full choke. When it does run it runs WOT and ungoveerend due to the choke. It seems like the adjusting screws do nothing until I back them out about 5-6 turns. I thought I had it figured out and i was able to mow with it but when i got through mowing I had no idle. it was like WOT no matter where i put the throttle. During mowing it seemed to have governer response but it was sluggish and slow. The governer linkage was moving and snappy but the card was not.

Any suggestions?

#2 olcowhand ONLINE  

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Posted June 05, 2011 - 07:03 AM

DD carbs are a finicky bunch, but this may be due to a leak in the intake assembly. To run wide open with the choke on, it must be getting more air from somewhere else. Take a good hard look at the intake. It's a 2pc intake put together with a rubber seal inbetween the halves, and the rubber seal sometimes gets sucked in. It may not show to the eye, but if you could get it to run slow enough to check, you can spray WD40 on the intake to see if there's a leak. I normally use carb spray, but it causes the engine to speed up if it sucks it through a leak zone. You're having enough trouble with high RPM's as it is. WD40 will actually slow the rpm's when it's sucked in (at least it did with me). Could be the intake to block gaskets too.
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#3 mikebramel OFFLINE  

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Posted June 05, 2011 - 09:14 AM

Definitely. If the adjustment needles arent responsive you have a problem elsewhere. I had one that would only rev up half ways at WOT with the choke on. Needed intake gaskets and the manifold resealed. Used Permatex something and #10-32 cap screws for the manifold
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#4 mikebramel OFFLINE  

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Posted June 05, 2011 - 09:15 AM

IMG00183.jpg

#5 coldone OFFLINE  

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Posted June 05, 2011 - 09:40 AM

[ATTACH=CONFIG]15529[/ATTACH]


No duct tape??

#6 mikebramel OFFLINE  

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Posted June 05, 2011 - 11:40 PM

Did you see it in the drawer???

:p

#7 MH81 ONLINE  

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Posted June 06, 2011 - 07:11 AM

No duct tape??


Did you see it in the drawer???

:p


Must be out right now?:bounce:
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#8 coldone OFFLINE  

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Posted June 07, 2011 - 08:01 PM

Yep its the intake. I had a little time to pull it off and look at it. There were a few places that the seal was missing. I used some epoxy putty for a temp fix and put it back together. I did not get it sealled all the way but it is definately a better machine now. I do have an Onan connection so he has hooked me up with a tested manifold. Its on its way.




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