After months of perfect operation my 185 started surging, loading up and quitting. On inspection of the pump I noticed there was a hole where the regulator nipple used to be on 175 pumps. Is this normal for the 185 pump regulator? With the WC coming up soon, any help would be gratefully received

Thanks

Keith

Looks normal, mine has the same.

Thanks for letting me know.

Keith

Hey Keith,

Was the engine surging only at idle? How was the top end?

Cheers
Scott

Hi Scott, No it would fly great for a few minutes and then start surging and then not opening up. I thought it was a clunk issue to begin with but that wasn't the case.

A couple of guys who have them here in the UK reckon there is a plug missing where the nipple used to be and that they had the same issue as me. When they blocked it with a grub screw the problem went away. Yet I contacted YS about this I was assured that there should be a hole there. Also similar info as post #2 from Wild Beat...? Not sure what to think so waiting for a replacement pump to arrive and then we'll see. At least it gave me a good chance to run the back up engine for Switzerland.

Keith

Hi Keith,

It's a coincidence, but one of mine started doing the same 3 days ago after 400 flights with no problem whatsoever. The hole in the reg won't cause any problems. I stripped my engine and fitted new bearings, (it was due), and a ring while I was at it. I noticed the needle valve O ring had split, so replaced that thinking that was the problem as symptoms was similar to sucking air.
Ran OK for 2 flights then started doing the same again. I have a new pump, but haven't had time to fit it and try yet, as I am on my way back to work now. I have heard of others having pump issues, but haven't myself yet. Maybe now?? I'll fit it next week and see how it goes.

Like you, it gave me an excuse to fly my back up model and get it trimmed properly. The way it is flying, may very well become my number 1.

Let me know how you go with the pump.

Cheers
Scott

I guess I should add that my engine is running great without any issues (that's with a hole in the pump where the nipple used to be).

How many flights?

I have one of the first 185 engines and it has the nipple on the pump but it is simply disconnected as there is no nipple on the engine case to connect the hose to. Crankcase pressure was used as reference pressure on the earlier engines, on the 185 this is not done anymore, if it is not vented then it will cause an air lock which will add to the spring tension, so probably capping the hole will hide the real problem as the air locked inside will be compensated by the pump adjustment, I mean, the pump action will vary a lot if plugged and unplugged with the same adjustment.

Regards

Check the pipe and make sure a baffle has not come loose.

I now have a replacement pump and it has no nipple on the regulator housing; just a hole that allows you to see the spring inside. I'll fit it later this week and see how the test flights go.

Keith

Hi Keith,

Looked like the weather was a bit challenging at times in Switzerland. I see the electrics didn't like the rain too much.

It appears the Swiss put on a great world champs and the new live scoring system was great. Made it exciting, as we at home new the scores before the pilot landed.

Did you get the surging problem sorted and if so, what was the fix? I fitted a new pump, but still the same. It definitely seems like a fuel problem, so i'll richen the reg 1/2 a turn next time out and see what that does.

Scott

Found the problem with my engine

Hi Scott,

Yes I've seen that problem before; shame there's no way to fix the casting.

I've bench run the 185 for nearly a complete tank and had no sign of the issue repeating. Power is good (7100 rpm on 21 x 10.5 APC) and idle very consistent. However I have yet to re-run it in the air and after sustaining damage to my Axiome + wing, will be unlikely to run it for quite some time. I'll let you know if & when I do

Best wishes

Keith

Drac,

Have you tried this Rapid Fix glue it works on casting and you can get it from REPCO.in Australia,

regards

Hi Keith
I have 2 Axiome+ wngs 2 CT call Me.
I sent you my Information.
Fran

Hi Keith
Forgot to send my E Mail to you.
[email protected]

Fran

Thanks for the advice.

Never tried it. It may or may not work, but in this situation I doubt it and I am not interested in stuffing around trying it. 60 bucks for a new housing - done deal.

I have always done my own maintenance/repairs, but a mate gets a good deal with Naruke, so it's on it's way there for a rebuild. It will be interesting to see if there is any difference in performance.