Question about McCulloch FHH25A Gas Pressure Washer

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My pressure washer runs 4 about 20-25 min then it starts knocking and pinging then shutsdown it has plenty of oil i checked it and replaced it with 5-20 oil it starts hard always has if you let it sit for about an hour it will start back up sound fine and work good untill it happens again any thoughts to what might be happening to it?

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Sounds like the engine is overheating either due to restricted air flow over the cylinder and head assembly, or the engine is running very lean due to a plugged fuel filter, dirty carburetor, or plugged muffler. Hope this helps!

Posted on Sep 29, 2010

Testimonial: "i checked all the things u said to check and it was not getting a good air flow so i took off the sides and changed the oil again perfect thank you"

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05 cobalt manual oil pumped clogged up, engine almost ran dry. replaced oil and filter and few days later engine started pinging. kinda moderate when idling then very rapid while driving. Wanna do the


pinging is from spontaneous combustion ( detonation) and is from incorrect air /fuel ration and ignition timing. Run fault codes and check knock sensor and MAF/MAP/VAF sensors . Left un- checked it will melt holes in the pistons.

Feb 19, 2014 | 2005 Chevrolet Cobalt LT

1 Answer

I have a ANNOVI pressure washer and I can not seam to get the engine apart from the pressure pump. All bolts are removed and the bludy thing will not come apart. The lock nut on the drive is not even


There may be no good news for you. Once those hollow shaft pumps seize to a engine shaft, they can be real buggers. In fact, they can be impossible.

But before you give up and completely destroy the pump to remove it from the shaft -- the mounting flange has threaded holes that are designed for taking the pump off. The bolts that you removed go through unthreaded holes on the pump flange and into threaded holes on the engine. On the pump flange, there are also either two or four threaded holes. So you take the same bolts and screw them into the threaded flange holes -- the idea being they will contact the engine as you screw them down and push the pump outward.

BUT: this does not always provide a fix. That flange is made out of cast aluminum so it is not very strong. It breaks quite easily. So your best shot at getting the pump off this way is to go slow. Put some oil on the bolt threads, so they will turn easily. Try to bring them up to equal pressure and then use a meium hammer to "ping" somewhere. Remember though, the entire pump casing is made out of this cast alluminum and is very brittle. It is easy to knock a hole in the pump with a hammer. But alternating with some persistent pinging and then tightening the bolts a little more (tighten/ping/tighten/ping) is the shot you have. When tightening down on the bolts - equal pressure on each side is very important. And I can't over emphasis....just a little bit at the time! And if you can (if there is room) pinging on the engine shaft a git can help too.

If it seems to move a little, but then gets even more resistent, oil the engine shaft and knock the pump back down and then start over going in the off direction. This is because once you get some oil under the hollow pump shaft it usually will free up.

From someone who knows how frustrating it is, I hope this helps you. If it does, please take a sec to rate me. Thanks!
Don

Mar 18, 2012 | Garden

1 Answer

Just replaced feul pump ran good 2 weeks now started knocking like it ran out of oil but it has plenty. What could cause the knocking?


I would check the actual oil pressure with a wet gauge. Locate the sending unit on top of the oil filter housing, remove the sending unit and install the wet gauge to check the actual oil pressure.

Nov 07, 2010 | 1989 Volkswagen Golf

2 Answers

Dodge caravan '98, oil light on, plenty of oil


If the engine is not making any knocking type noises, check the oil pressure sending unit. If it is leaking oil then it needs to be replaced along with removing the rubber plug from the connector and cleaning the terminals. If the oil light still comes on then the oil pressure is definately low and could cause engine failure.

Jul 03, 2009 | 1999 Plymouth Grand Voyager

2 Answers

Karcher K 3.68 M operation


These units have pressure valves that automatically turn off the pump once the pressure is high enough. The pressure switches do fail and sometimes stick and act as you've described.

May 07, 2009 | Alfred Karcher K 5.93 M Electric Pressure...

1 Answer

Engine knock...


Oil pressure might actually be a bit high for idle. High or low oil pressure in an older engine tends to be indicative of some serious issues. Oil pressure that is too high tends to be a clue that you have serious carbon build up. That aside, have you tried running a higher octane fuel, or perhaps adding an octane booster to your normal grade? Pinging can become knocking in a badly worn engine. One recommendation: At your next oil change try substituting a quart of marvel mystery oil or lucas engine oil treatment in place of one quart of your normal oil. Both have some pretty good track records for helping to free up sticking valves and break up carbon in older engines. I'm an old timer myself, and I personally swear by Marvel for older engines. There is no "rebuild in a can" but Marvel comes close. Give those a shot, let me know what happens.

Feb 06, 2009 | 1990 Ford Bronco

1 Answer

Engine knock when going uphill +...


Oil pressure might actually be a bit high for idle. High or low oil pressure in an older engine tends to be indicative of some serious issues. Oil pressure that is too high tends to be a clue that you have serious carbon build up. That aside, have you tried running a higher octane fuel, or perhaps adding an octane booster to your normal grade? Pinging can become knocking in a badly worn engine. One recommendation: At your next oil change try substituting a quart of marvel mystery oil or lucas engine oil treatment in place of one quart of your normal oil. Both have some pretty good track records for helping to free up sticking valves and break up carbon in older engines. I'm an old timer myself, and I personally swear by Marvel for older engines. There is no "rebuild in a can" but Marvel comes close. Give those a shot, let me know what happens.

Feb 06, 2009 | 1992 Buick LeSabre

1 Answer

Pressure washer wont idle and run


check the pressure replace valve or a bypass valve

Jun 05, 2008 | Karcher 2500 PSI Pressure Washer

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