24HP V-Twin B&S - Fault driving me CRAZY!

[BlazNT]

Where do I find the oil orifices in the block?
I guess this means I need to strip down and open up the whole engine again? :frown: ...... Will I need to buy a new sump pan gasket?

Many thanks.
Neo

Oil is pumped into the heads. So I would start by taking off the valve covers and looking for the holes then spraying carb cleaner in them then compressed air. If that does not work then remove heads and do it again. Then if it is not working you may have to disassemble the engine.

 

[Neo7]

Ok I've spent all day working in the B&S. Took the sump cover off and here's what I've observed ... There appears to be no pumped oil that goes into the Cylinder Head Chamber (CHC). There's two large holes above and below the tappets (I can fit my little finger in it) that allows oil to be splashed into the CHC, probably thrown off of the Camshaft as it spins.
The two Big End bearings are pressure lubricated through a tube which is actually inside the Crankshaft and the Camshaft bearings and Top Crankshaft bearing are pressure lubricated through a tube inside the Camshaft (this is clever stuff lol!). All oil entry/exit holes are quite large (2 to 4mm) so they would be quite hard to block.

Despite learning so much about this engine today as usual I found NOTHING really wrong with it but have some suspect points. ...
The Oil Collector Vale ... Looks Ok but how can I test it? ... If the valve is leaking it would reduce oil pressure I guess.
The Oil Collector Filter - https://www.amazon.com/Briggs-Stratton-794389-Collector-Replaces/dp/B005F6Q93Q was in poor condition with two chunks missing... Does anyone think this would have an effect on how the engine runs?
Interesting that the Oil Collector compartment has port hole into Cylinder 1 CHC but not ino Cylinder 2 CHC. This might explain why Cylinder 1 CHC was getting Oil Ok.

Been a long day... This engine has got to be the biggest pain-in-the-*** on record lol!!

Many thanks for your participation ;-)
Neo

 

[(Account Closed)]

I would think they'd be more than just a splash from the crankcase to the valve cover.

Someone else more knowledgeable will have to chime in about that.

That last picture, are those hair line cracks coming out to the sides??? There's NO casting marks(if casting marks) elsewhere... What is that part please?

I gather you blew out the crankshaft and every other hole you could find.

If that missing filter section, stayed together and got into an oiling orifice, that WOULD be a problem...

Are there spec's for the oil pump "impeller", etc and has that been checked? Just trying to rule out a bad oil pump, not enough volume / pressure to make it to the bad cylinder..

 

[Neo7]

I would think they'd be more than just a splash from the crankcase to the valve cover.
Someone else more knowledgeable will have to chime in about that.
That last picture, are those hair line cracks coming out to the sides??? There's NO casting marks(if casting marks) elsewhere... What is that part please?
I gather you blew out the crankshaft and every other hole you could find.
If that missing filter section, stayed together and got into an oiling orifice, that WOULD be a problem...
Are there spec's for the oil pump "impeller", etc and has that been checked? Just trying to rule out a bad oil pump, not enough volume / pressure to make it to the bad cylinder..

I inspected the CHC really well but found no other oil holes but the spashholes (and the extra side vent in Cylinder 1) .... Also I've previous had a rocker cover off with the engine running and it does tend to spit out everywhere.

Sorry that last picture is the top bearing seat for the camshaft showing two oil vents. One going to the top Crankshaft bearing and the other going to the Oil Collector Chamber. No cracks just poor quality B&S casting lol!!

Yes I blew out all holes with an airline ... All were completely clear .... In fact the hole engine is as clean as a whistle lol! .... and there's no a trace of any bits from the plastic sponge (Oil Collector filter) either.

I have a micrometer (imperial) so if anyone knows the measurement specs for the pump components please let me know?.... The pump is quite simple and the metal components are showing no wear that I can see.

Many thanks.
Neo

 

[Neo7]

It seems the plastic'ish filer mesh thats goes inside the Oil Collector Chamber is a very hard to buy over here .... without spending a fortune!!
Does anyone know of a readily available substitute material I can cut to size?
CANCEL THIS REQUEST ABOVE.... I found something that's almost an identical mesh and rated for high temperatures too... A BBQ Scourer :laughing:

I have also included a picture of the Oil Collector Chamber which shows the Oil vent hole into Cylinder 1


Many thanks.
Neo

 

[Neo7]

Ok here's another update.

Engine is all up and running. Cylinder 2 always runs hotter than Cylinder 1 but when you put the plastic cover on it runs at a reasonable 65 degrees at idle. Oil only splashes into Cylinder 2 CHC when the engine is reved up and it's all fine after that. Long story short I think I just wasted another two days with this engine because it's still randomly pop, pop, popping (at all revs)!

Now I'm questioning everything I've done previously. So again I tested the manifold for leaks (engine running) by spraying with degreaser and compressed air but it didn't miss a beat.
I swapped the ignition coils with my other V-Twin but no change.... Oh and I also check the flywheel for bogus magnetic spot ... but nothing.

I could even ignore the pop, pop, popping and bolt it into the mower ... but that would be admitting defeat :tongue:

This is the "Engine from Hell" so can ANYONE come to my rescue with that spark of inspiration that leads me to finding this fault!!!


All the best.
Neo

 

[Boudreaux In Eunice La.]

Hey Mon Ami ............. It's been a while ole buddy......

The only thing I can think of now is still that damn intake manifold......... If it's warped then nothing will seal it..... BUT you say you are spraying carb cleaner and such while it's running top, bottom and sides so I guess that will eliminate that........

Did you get that new valve lapped in good ?????

Plus Tard Mon Ami ~!~!

 

[Scrubcadet10]

Didn't taryl have a video with a similar engine that was popping?
Turned out being a wore cam lobe, but I'm sure you checked that.

 

[Neo7]

Didn't taryl have a video with a similar engine that was popping?
Turned out being a wore cam lobe, but I'm sure you checked that.

Yes engine has been stripped down and all the lobes were checked OK .... but thanks for the suggestion :smile:

 

[Neo7]

Hey Mon Ami ............. It's been a while ole buddy......

The only thing I can think of now is still that damn intake manifold......... If it's warped then nothing will seal it..... BUT you say you are spraying carb cleaner and such while it's running top, bottom and sides so I guess that will eliminate that........

Did you get that new valve lapped in good ?????

Plus Tard Mon Ami ~!~!

Hi Boudreaux,

Thanks for your reply ... I was kinda wondering if you'd given up on me :laughing:
Yes I'm still considering replacing the manifold (indesparation!) but this engine has already cost me more than my first girlfriend!!! :ashamed:
Yes I got the new valve lapped. Nice thin sealing line (I'm told that's the best) and it passed the Kero leak-down test with flying colors :thumbsup:

Someone once told me that if you have an unsolvable problem you should Brainstorm and take note of any suggestion (wild or not) and the solution will be somewhere in thw combination of those suggestions..... And I note that no one has suggested I trash the engine yet :laughing: