(Click on the Diagram for the Carb Breakdown.)
1. All Carb Kits are not created equal. Does your carb need a repair or a rebuild? Be sure to check out the section below on Carb Rebuild Kits.
2. If you are going to rebuild your Carb, do it properly. Installing the new rebuild kit with floats and then not bothering to Set the Float Level is bad mechanics. The float level tool is widely available and worth the extra money to do the job correctly. On a side note we rarely see float failures, usually just not adjusted properly.
3. Repairing/Rebuilding your carb is not the only fuel system maintenance that should be performed. Your fuel system also includes fuel filters (more than 1), fuel tanks, fuel pump, tank selector valve (if equipped) and fuel lines. If you have debris in your carb, cleaning out the jets and bowl is only a short term solution. Bottom line, maintain the full system.
4. The inside of the fuel tanks can peal. The resulting orange flake debris can cause lots of problems. Lead additives tend to increase this problem. (Lead additives are unnecessary with the Unimog and Pinzgauer, but you would be surprised how many people use it "for good measure.") If you are getting orange flakes in the filters take care of your tank. At a minimum remove the tank and completely clean and flush it. If the problem is bad, send the tank out and have it sealed professionally.
5. Jet your Carb for the area you primarily run in. You want to run it leaner at higher altitudes, and richer at the lower altitudes. Most Unimog 404's and Pinzgauers come jetted with 140's. Those living above 5000' may want to consider 130-135's in the Carb. Most dealers can supply the required jets for your area. Changing out the jets is a quick process, so carrying an extra set is not that uncommon.
6. Idle mixtures screws are quite often damaged. If you have never checked them on your truck, its time. The most common problem is that they have been screwed in too far damaging the ends. Replace as needed.
7. Check for loose Nuts/Bolts. The Pinzgauer is very prone to this. Specifically check the float bowl cover screws, and the base mounting nuts. Quite often they have worked themselves loose and can cause serious damage by creating an air leak and overheating a cylinder.
8. Carb Gaskets are known to weep gas. This primarily occurs on the top float bowl gasket. Usually the culprit is that the float bowl cover and float bowl are not perfectly flat. Any good rebuild should include "stoning" these two pieces. If it is a persistent problem you may want to move to one of the slightly thicker aftermarket gaskets available.
9. 50% of the Carbs we open up have had the O-ring installed on the Low Speed Jets incorrectly, or are missing the O-ring completely. When installing the new O-rings, they are installed on the low speed jets after the threads, not prior. For a better explanation call the shop.
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