53 Flathead running rough

D

dgmgohl

Member
Hi, I was going to replace the power valve in the teapot carburater for a 53 Merc flathead. After taking it out, and bringing to a couple of local parts stores, all they had available, and what shows from Holley is a power valve that looks like a bolt with a large nut on top. Mine looks like a bolt with the plunger in the center. To any event, I removed the gas inside, removed float, spring to access and clean because of dirt on the bottom. After reassembling, the cars runs really rough. After tightening all screws, cleaning, could this affect the timing? There's no backfire. I have the float and float spring installed correctly, along with the seat and needle. A head scratcher.
 
Nothing you did would affect the ignition timing. Chances are maybe the power valve diaphragm assembly (economizer) is ruptured, brittle or pinched on installation. That would keep the power valve open all the time. Very common with the teapot type carbs. Power valve is in the bottom of the bowl between the main jets. This is assuming your '53 Merc has an original style carb.
I can also rebuild for you if it comes to that.


Sal
 
http://www.carburetor-parts.com/2140-_c_138.html


Here is a link to Mike's Carburetor parts. They have the Gas enrichment valve diaphragm that I think you may need. The actual brass power valve that screws in the bowl between the jets is not re-produced, and never really goes bad.
The link I supplied shows the Gas Enrichment Valve Diaphragm (part # 70-45).
They also have complete rebuild kits on the website. Search under Holley model 1901 carburetor for the complete kit.


Also, I can go through the carb for you if it becomes a problem. Been doing them for over 50 years.


Sal
 
Get it rebuild if you can. You can rebuild it too!


Certain things like a distributor and crab I like to get rebuild from a resource. I had a great guy in fl for race carbs, so good.



I know how to mostly rebuild, bore, linebore an engine, but I lack the tools to do so. So I would send a block off to a good rebuilder.


Fine tune from there. Depends on what you have time and can do.
 
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