Hi Jarek Here’s my two cents worth- i use automatic transmission/power steering fluid in my cd150’s. seems to work fine and haven’t had any compatibility issues with rubber diaphragms etc as yet. The oil and plunger act as a damper for the piston to which the needle that alters your fuel air mixture is attached. Over the years i have heard various stories from people that use these carbies n race cars that actually snip the damper off(similarly people that don’t put any oil in there), to stories from people that use them in multi carb set ups (ie 12 cylinder jaguar engines) that can’t get them to tune properly without the correct oil (though after some discussion i believe that spindle wear was more their issue). In an automotive situation there will be some minor noticeable throttle response differences but in the dimona application i suspect the differences will be minimal particularly as instantaneous dramatic throttle changes should be rare. The rev issue The reason the book states that prolonged operation in that rev range is to be avoided during cruise is indeed because of a bad harmonic (potential for cracked crankshafts etc) Thus, i believe that it is a problem whether the blades are in fine or course pitch it is just operating in that rev range with a moderate load on. In saying that, these are a reasonably robust little engine, don’t be scared. Note the emphasis on the word prolonged. Please someone jump in if they have info to the contrary this is just what i have learnt over the years and am always willing to learn something new.
From: [email protected] [mailto:[email protected]] On Behalf Of Jarek Steliga Sent: Thursday, 18 October 2018 5:47 PM To: [email protected] Subject: Re: [DOG mailing list] Zenith 150 CD 3 - oil Hello again, If my oil "mixture" is too thick (or too thin) what are the symptoms? Does the carburator respond with a delay or too fast to the throttle inputs? Is that dangerous or just annoying and easily noticed? Regards Jarek czw., 18 paź 2018 o 08:43 Jarek Steliga <[email protected]<mailto:[email protected]>> napisał(a): Thank you śr., 17 paź 2018 o 23:28 Rob Thompson <[email protected]<mailto:[email protected]>> napisał(a): Part number 10 on the diagram. regards Rob Rob Thompson 0429 493 828 (Please note that my new email address is [email protected]<mailto:[email protected]>) On Thu, Oct 18, 2018 at 7:50 AM Jarek Steliga <[email protected]<mailto:[email protected]>> wrote: Hello Rob, The oil seems to disappear too fast as you say. Could you help me to identify which particular o-ring on the attached drawing needs to be replaced? When you mention 5/xx multigrade, do you mean 5W/xx? Best regards Jarek [Carburator drawing.JPG] [My carburator - a photo.jpg] ---------- Forwarded message --------- From: Rob Thompson <[email protected]<mailto:[email protected]>> Date: wt., 16 paź 2018 o 22:23 Subject: Re: [DOG mailing list] Zenith 150 CD 3 - oil To: <[email protected]<mailto:[email protected]>> Hi again Jarek, You can use straight engine oil but even a 5/xx multigrade is a bit thick and tends to dampen the piston too much. We mix 50/50 light machine oil and engine oil. If it keeps disappearing it means that the rubber O-ring which seals the needle inside the piston is perished. regards Rob Rob Thompson 0429 493 828 (Please note that my new email address is [email protected]<mailto:[email protected]>) Hello, As per Limbach Maintenance Instruction, only a specific oil p / n: 170.210.005 can be used to fill up the carburator. Since this seems to me pretty pricey, can other, readily available oils be used in its place? What is its recommended viscosity? Best regards Jarek
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