#1
IP: 98.237.192.199
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Cannot safely fit late model carburetor into Ranger 29
Hi folks -
My engine now has a few Issues, and I have a mechanic scheduled to come take a look. However, there's a fundamental problem: The oil pressure sender mounted towards the fore is forced out of the way by the (new) late model carburetor+adapter+flame arrestor. This causes two specific problems. 1. Engine wouldn't start because the oil pressure sender shorted through the flame arrestor->carburetor->engine. I have temporarily "installed" a piece of electrical tape to prevent the short, but can't imagine this is by design -- or safe. 2. The minor adjustment I had to make to the mounting of the oil pressure sender to install the flame arrestor has resulted in an oil leak feeding from the engine into the oil pressure sender. I do not believe the horizontally mounted flame arrestor would remotely fit in this opening either, but don't have the dimensions to prove it. Was there some installation secret I missed? Am I just out of luck? Images attached. |
#2
IP: 104.174.83.118
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Oil pressure sender shorting through the flame arrester - I don't see how this is possible. Everything about the oil pressure sender is grounds and the flame arrester is grounded so what can short? Even if the wire that attaches to the sender touches ground all that happens is the gauge needle pegs high.
As for no room for the sender, relocate it to a bulkhead anywhere you want with a short piece of 300PSI oil rated hose. Be sure to include a ground wire to the case of the sender or it will not work. Include the oil pressure safety switch I see in the picture with the sender relocation.
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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 |
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sastanley (01-27-2021) |
#3
IP: 47.142.133.234
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The device in the picture looks like an OPSS. The wire closest to the back flame arrestor goes to a fuel pump? The other wire on the device is connected to the + terminal on the coil?
When you start the engine the oil pressure rises and the OPSS closes* and the wire from the coil is now grounded to the back flame arrestor which results in a shut down. Can you move the OPSS out on a nipple or as suggested to a bulkhead? * The OPSS is a normal open switch ex TRUE GRIT |
#4
IP: 98.237.192.199
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Quote:
It's rather tight quarters. I'm pretty sure I can remove the OPSS (drain oil, unscrew, etc.), but I can't imagine having enough bulkhead space to mount it elsewhere. Putting some sort of extension wouldn't really work -- and I don't even really need an extension, I just need to rotate it ~15 degrees. Is there any way to reposition it? |
#5
IP: 47.142.133.234
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YES!
The hot lead to the OPSS should be fuse protected rather than insulated by a piece of tape.
You are risking melted wiring and possibly starting a fire. ex TRUE GRIT |
#6
IP: 98.237.192.199
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Agreed and understood. I'll insert a fuse into the wire.
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#7
IP: 67.234.39.238
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My oil pressure gauge is mechanical so I do not have the bulky sender. There are pics in the online parts that show the "proper" set up and there is plenty of room between the OPSS and Flame arrestor. As you say just turning, counterclockwise, should separate the terminal from the flame arrestor but that would be loosening the whole setup and could cause a oil leak and if it is loose it could flop back down and cause the same problem or worse. You may just have to rebuild it properly. Easier said than done.
Dan S/V Marian Claire |
#8
IP: 162.219.70.239
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Late model engines have a second oil pressure port near the oil pressure adjustment that an OPSS can be installed in. Does the early model engine not have that port?
Peter |
#9
IP: 98.237.192.199
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Quote:
It definitely caused a leak. =] I'll look for the pictures of the proper setup and see if I can remove and adjust -- I discovered that I need to change the oil anyway, so... I don't think I have one, sadly. Where there would be one on my engine I believe there is a mounting bracket for the throttle cable. I am, however, going to go down and double check later today. |
#10
IP: 67.234.39.238
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I dug in my spare parts and it seems to me that the addition of the adapter would push the flame arrestor forward almost 1/2". The total length of a late model flame arrestor frame is about 4 1/4" and slides directly on the carb about a 1/2". I am not on the boat so I can not measure the length of the early frame assembly. How much room do you have from the forward end of the carb to the terminal on the OPSS? If it is more than 3 3/4" then maybe a late model frame would work after removing the adapter. ???
Dan S/V Marian Claire |
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OfficeMonkey (01-26-2021) |
#11
IP: 67.234.39.238
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Quote:
Dan S/V Marian Claire |
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OfficeMonkey (01-26-2021) |
#12
IP: 98.237.192.199
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Quote:
Quote:
Based on dimensions, I think my best plan of action: 1. Not start the engine any time soon. 2. Get 90 degree brass elbow (dimensions to be determined). 3. Drain oil. 4. Relocate oil pressure sending unit to oil pressure port aft of fuel pump. 5. Reattach oil pressure alarm to existing fore oil pressure port. 6. Reconnect oil pressure sending unit -- putting a fuse inline before activating. 7. Refill oil. |
#13
IP: 98.237.192.199
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Inserting missed photos.
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#14
IP: 67.234.39.238
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Thanks for the info. I figured the space was going to be to small.
The nut in your pic is the locking nut for the oil pressure adjustment. The nut has to be loosened and then the threaded part turned in to increase pressure or out to decrease pressure using the slot in the end of the threaded part. The port is the smaller plug with a slot in your pic. The Moyer 360 shows the OPSS installed above the oil pressure adjustment. https://www.moyermarine.com/mmi360/r2z1.html You can see the early style pressure adjustment assembly at the bottom of the page here. https://moyermarine.com/product-category/oilsystem/ Dan S/V Marian Claire Last edited by Marian Claire; 01-26-2021 at 02:03 AM. |
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OfficeMonkey (01-26-2021), Peter (01-26-2021) |
#15
IP: 47.142.133.234
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If you want to start the engine before the repairs\modifications are completed take the the two wires off the OPSS, hook them together, and temporally wrap the connection with tape. This will bypass the OPSS.
ex TRUE GRIT |
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OfficeMonkey (01-26-2021) |
#16
IP: 138.207.177.95
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My oil pressure sender and the alarm-OPPS are remote from the engine. Adding an oil filter is nice too.
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#17
IP: 98.237.192.199
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That's beautiful. I don't think I have the space for it, but I'll double check.
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#18
IP: 138.207.177.95
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It came from here:
http://www.atomic4.com/oilfilter.html |
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