Hydramaster 3.2 Vacuum Loss Caused by Engine

**bayareasfinest** · 08-06-2010, 12:25 AM

Then im definatly going to give that a try. I ordered a igntion coil since one of the spark plugs was black and the other one was normal and see if that does it . If not im taking it in, ill post up when i find out what it is

**RCC** · 08-06-2010, 01:08 AM

Your Carb float valve may not be working. That will cause gas to flood the carb and bog engine down. Run engine and when it bogs, pinch or cut off fuel supply. If it runs normal on what is left in the float bowl, then you know the problem.

**Ara Klujian** · 08-06-2010, 05:50 PM

Originally Posted by RCC

Your Carb float valve may not be working. That will cause gas to flood the carb and bog engine down. Run engine and when it bogs, pinch or cut off fuel supply. If it runs normal on what is left in the float bowl, then you know the problem.

If the float was stuck or set too high fuel would come out the overflow tube.

**Ara Klujian** · 08-06-2010, 06:27 PM

A new coil will not solve your problem. If you are really concerned about the coil I suggest doing a cylinder balance test before you waste your money. This test will allow you to see if the truck dies out or stays running. The side that stays running while the plug wire is off will be the bad side. A new coil will not rectify fuel spraying out the top of the carb. Raw fuel would simply pass through the chamber and out. And your spark plugs would be wet and clean.

**highmarkschooner** · 08-07-2010, 03:14 AM

i agree with Ara, i think you might have a valve problem. in the video it looks like that splashing unburned fuel is going up not down which would seem to me be caused by backpressure in the intake which would indicate an intake valve not seating properly or valve timing (duration) is off. do a compression test, if the side with the black spark plug has low compression then a valve is probably the problem. it seems to me you are running on 1cylinder and that is why it won't rev up.
btw where are you located? maybe someone close to you can help.

**Ara Klujian** · 08-07-2010, 07:05 PM

Actually Kevin I have been trying to say that it is too rich a mixture. If it was a valve not seating it would be flames rather than raw fuel spewing out. Maybe I should try to make my posts more clear. I try to do the best I can so people understand what I am trying to say without writting long novels.

**highmarkschooner** · 08-07-2010, 07:46 PM

Originally Posted by Ara Klujian

Actually Kevin I have been trying to say that it is too rich a mixture. If it was a valve not seating it would be flames rather than raw fuel spewing out. Maybe I should try to make my posts more clear. I try to do the best I can so people understand what I am trying to say without writting long novels.

yes it is a lot easier to say what your thinking instead of writing it (without making it a book).

being to rich makes some sense however it does not explain why 1 plug is fouled and the other is not. also it is hard to tell in the vid if the gas is squirting out of an orifice in the carb or being sprayed back out of the carb throat from backpressure in the intake. you also can't tell what it sounds like in the vid when he opens the throttle, that would help alot.

i have had an engine break a rod due to low oil and after the initial sound of metal banging around and adding oil it would start back up and run good on the other cylinder but when i throttled it up there was not enough power for the engine to rev up with the load of the blower and water pump. it seems this engine may also be running on 1 cyl. for a reason not yet determined.

so if it were me, Stavros, i would first do what someone else said and turn the fuel off and run it to see if it clears up when it starts running out of fuel, that will determine if you are running to rich. if that don't work do what Ara said and run it and pull off 1 plug cap at a time and see if its running on one cyl and not the other. then do a compression test to see if low compression is your problem. if thats not it check your spark, although it is very highly unlikely that this is an electrical problem since you have fuel blowing out of your carb.

enjoy my book?

**bayareasfinest** · 08-08-2010, 03:12 PM

Thank you all for posting alot of valuable info i really do apreciate it. But i already tryed what you all posted and nothing worked. I puled one plug of at a time and the engine would chug and die it wouldnt stay runing that for both sides one at a time. I opened the little cap that the valve springs are and i checked them to see if i had a broken spring instead i found that one of them had no play and the other 3 did. I adjested them to where there was no play and the engine ran worse, I would rev it and no change. So i adjusted the valves to where there was some minimal play and the engine runs again the same as before a lil better maybe. I opened the caburator and adjusted what looks like a set screw in it opened it up, closed it down then and then same thing. I dont know how to fix it, im located in Antioch, ca zip code 94509 if anyone is near by ill pay you to fix my problem. Anyhow yesterday someone bought out my trailer so i took all my stuff and its now seating in the garage and will be alot harder to diagnose since no fuel or battery unless i hook it back up. Should the valves have some play? Ive only adjusted valves on hondas but with a filler gauge. Any suggestions greatly apreaciated. And i changed the spark plugs and now the both look the same after running them for a while. Like my book?

**highmarkschooner** · 08-08-2010, 06:40 PM

yes the valves should have a little play when seated but they need to be properly set with a feeler guage. did you do a compression test? if the compression is good it is most likely running rich as Ara stated. something in the carb. like float level or needle valve not shutting fuel flow off. what are you doing with it now, is it going in a van or another trailer? take it to your local mower shop they can fix it. i am about 2.5hrs away or i would look at it.

**bayareasfinest** · 08-09-2010, 12:34 AM

i have not done a compression test yet its on my list to do tho. Ive been busy with other things i just sold the trailer and lookin for a good running van. And ill be transferring into that, but i guess im gona have to take it in to "Clean quest" in concord about 20 mins from where i live they service truckmounts. I called lawn mower shop and the guy came and took a look and said it was too big of a project for him. And his been in the business for 20 + years he said so. I dont know i looked at the float there is pin on the other side of the float to cut off fuel but how would i know if its not shutting off?.....i looked at it for obvious damage but found non. I run the fuel pump and the float came up but i dont know if its cutting off circulation to the carb completly when it comes up.