#101
IP: 142.116.40.164
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Quote:
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Greg 1975 Alberg 30 |
#102
IP: 174.89.9.127
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So I have oil pressure now. At the default setting I'm getting about 25-30psi with cold engine.
Of course the issue I now have is I cannot get it to idle under 1200 rpm. -The dizzy with points and is set up and positioned as per the manual. - the carb was cleaned during rebuild and the air/fuel screw is 1-1/2 -turns out from all the way in - the idle for the throttle is as "low" as it can go and not have the engine die. - Read the manual and searched on here for others with the issue. Not having any success. Is there a guide, or sequence of steps people have come up with that have experienced this.?
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Greg 1975 Alberg 30 |
#103
IP: 104.174.83.118
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Thanks to Thatch several years ago I learned that precise timing has a dramatic effect on the ability to maintain a low idle.
https://www.moyermarineforum.com/for...d.php?p=108158
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#104
IP: 174.216.148.230
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I agree. Try dialing your timing back a bit.
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@(^.^)@ Ed 1977 Pearson P-323 "Dolce Vita" with rebuilt Atomic-4 |
#105
IP: 142.116.40.164
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Thanks for that folks
I'll work on that and will do another cleaning of the carb this evening just to make sure.
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Greg 1975 Alberg 30 |
#106
IP: 142.116.40.164
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ok, recleaned the carb and did the Dizzy alignment trick as mentioned in the thread Neil linked to and started with the carb needle adjustment at 1 full turn out. Currently it is idling non-stop at about 800 RPM. It varies about the 800 mark by about 50 rpm on each side, but sounds smooth to me.
Marked the roll pin for use with the timing light and though the picture below is not when the engine is turning, this shows the approx. location of the pin in the timing light when set to 0 degrees (maybe a little more clockwise of current location). I am going to have to go back and reread all about dwell time and 17 degrees BTDC and 34 degrees that's been discussed before here as I am not sure if what is showing up at idle is good or not. There is still some minor distributor adjustments to make at idle but I only have two hands currently. Thoughts?
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Greg 1975 Alberg 30 |
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TimBSmith (05-10-2022) |
#107
IP: 69.250.111.245
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which one?
So, was it the carb rebuild or the timing adjustment that made it idle? When you do two things at once, you can't tell which adjustment did it. When down to fine troubleshooting, it is important to change ONE thing at a time. This is a lesson I learned from other members of this forum long ago.
edit - glad you got it idling below 1,200 in any case.
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-Shawn "Holiday" - '89 Alura 35 #109 "Twice Around" - '77 C-30, #511 with original A-4 & MMI manifold - SOLD! (no longer a two boat owner!!) Last edited by sastanley; 05-10-2022 at 01:14 PM. |
The Following User Says Thank You to sastanley For This Useful Post: | ||
TimBSmith (05-10-2022) |
#108
IP: 104.174.83.118
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**At what RPM? Idle or ~1800?
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#109
IP: 142.116.40.164
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Quote:
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Greg 1975 Alberg 30 |
#110
IP: 142.116.40.164
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Greg 1975 Alberg 30 |
#111
IP: 104.174.83.118
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Well then, unless I'm completely misunderstanding the position description, you're way too advanced still.
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#112
IP: 142.116.40.164
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Quote:
- The Rotor was pointing away from the block as per the "factory setting" - Rotated the plate until the tab was in-line with the rotor This is how it was set up but the tab was more counter clockwise for the pervious running. How much of a rotation can affect the timing as I have not done this before? I noticed last night that when the tab on the plate is aligned with the rotor, the points are just closing. Reading in the forum this morning, it was saying that the points should just be OPENING at this position. Can someone clarify? Or what I should be checking?
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Greg 1975 Alberg 30 |
#113
IP: 104.174.83.118
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Trying to understand to hopefully offer meaningful suggestions. Please describe in detail how you "rotated the plate."
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#114
IP: 142.116.40.164
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Sorry for my not clear descriptions.
Went back last evening and after getting TDC as per Don's video and after watching another YouTube video about adjusting the points and alignment until it just sparks, I checked what I had set and adjusted. Ran the engine and it idles well. With the strobe, the timing mark on the roll pin was sitting just to the right of indicator notch on the cover plate. Don't know the exact angle. Idle video https://www.youtube.com/shorts/Fp1wIHKk3rg Some Neutral transmission zone work to do.
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Greg 1975 Alberg 30 |
#115
IP: 104.174.83.118
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Sorry but that doesn't address my question. However, one thing is clear to me:
The roll pin timing mark with a timing light set on 0° should be exactly aligned with the cover plate notch. You still need to rotate the distributor body - - - not the points plate - - - a little more clockwise.
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#116
IP: 142.116.40.164
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Quote:
Sorry.. turning the body is what I meant in the previous posts.
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Greg 1975 Alberg 30 |
#117
IP: 104.174.83.118
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Thanks, I was hoping so.
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#118
IP: 142.116.40.164
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2-3mm more clockwise set it right.
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Greg 1975 Alberg 30 |
#119
IP: 104.174.83.118
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Have you tried adjusting the idle lower afterwards?
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#120
IP: 142.116.40.164
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The idle dropped about 100 rpm as I did it to about 650-700.
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Greg 1975 Alberg 30 |
#121
IP: 104.174.83.118
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Yep, that's the sweet spot. Mine did the same when I got the timing dialed in.
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#122
IP: 142.116.40.164
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swapped engines last evening. Now to spend rest of week getting it reset on the old shims and aligned with prop shaft.
Will tear this old one down for parts along with another partial engine I have in the garage. chuffed to reach this point.
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Greg 1975 Alberg 30 |
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sastanley (05-19-2022) |
#123
IP: 142.116.40.164
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The engine has been in for a couple of months now and still tweaking things. Running rich so slowly getting that adjusted in but otherwise running very smoothly, idling around 900. Also still having slight low oil pressure but am dialing that in.
Am having an issue with the exhaust pipe. I reused the existing as there was nothing rusted out about it. But it "appears" have a small leak between the exhaust flange and the threaded pipe (along the threads). I originally tried to get the flange off but to no success. With a CO meter this is where I am detecting the leak. Before I rebuild the system, is there a sealant I can use to get through the rest of the season up here in Canada?
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Greg 1975 Alberg 30 |
#124
IP: 142.116.40.164
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So my rebuilt mechanical fuel pump is leaking gas. I could feel a little on the outside of the pump so removed it and was able to tighten down the bolts holding it together about another full turn. Reinstalled and ran the engine for a couple minutes. Could feel a little gas at the base where it joins the block. Wow is that fun to try and get on and off in a tight space, especially that rear block bolt, even with the sediment bowl off.
Then discovered that it was putting gas into the oil. Changed that out a couple of time and changed the pump over to the old one off the block I cracked and never caused me any issues. No issues now but I am wondering what I did to cause the new diaphragm to leak. I am planning to take it apart this weekend and see...
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Greg 1975 Alberg 30 |
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