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August 29, 2018 at 7:00 pm #11007
I have a couple of questions about my 1954 Fleetwin (7.5hp) exhaust plate and gaskets.
I plan on using 2 gaskets (202580) – even though only one called for, I’m told one on each side of the plate is better. I’m also planning on using a sealer.
I have 2 gaskets on order but it appears they are getting harder to come by hence my first question: is it foolish to make one? Mine measure .030" and the material is fairly brittle. I have a lot of gasket material (.030") but it is a non-paper dark gray waterproof fairly pliable (easy to cut) material. I’m concerned the hot exhaust may affect the material.
My second question deals with the plate (203020). I have done enough of these old OMCs to know that the plate is always suspect of leaking so I typically replace them. These plates appear to be getting hard to find. I am considering just making them for my engines from a similar plate material. Is there a source for these plates or should I break out the cutting tools and make them?
Thanks for the help,
DrifterAugust 29, 2018 at 7:08 pm #81977For the gasket depends on the temp range of the material. Should say on your package. I make them all the time. Beware, the originals contain asbestos. Use precautions when removing.
If you are capable of sheet metal work, the plates are not that difficult to make. I had considered it, but figured would not be worth the time it would take for the money you would get. But for yourself, have at it!
August 29, 2018 at 7:10 pm #81978I think HIGH TRIM (AOMCI) made them… I purchased one years ago for a 7.5 perfect fit stainless steel plate
Joining AOMCI has priviledges 🙂
August 29, 2018 at 7:14 pm #81980High Trim is Chris P !
1946 Zephyr was who I got one from. Don’t know if he still has them though.
August 29, 2018 at 7:46 pm #81981nicknames nicked…names… 😯
Joining AOMCI has priviledges 🙂
August 29, 2018 at 8:02 pm #81982Sorry go by many names!
Correct, Zephyr was the one selling them. Not sure if he still is or not?
September 1, 2018 at 8:34 pm #82134I went ahead and made a plate from .025" stainless. I had a single gasket in my stash. But, no 3M47 – must have used it up or "lost" it. Did have an old bottle of Permatex Indian Head Gasket Shellac Compound so thought I’d give it a try. Coated both sides of all surfaces and let it dry then assembled. Let it sit overnight then ran the motor today. Results were excellent – motor ran great. Temp on exhaust cover was around 95 to 100 with the hottest point at the bottom rear of the cover at around 135. No leaks.
Now I have two more questions. Always more questions…..1) Have any of you used the Permatex Indian Head Shellac Compound? Results?
2) Permatex also makes a "high heat" gasket spray called "Copper Spray-a-Gasket". The write up and video are very good. Has anyone ever used this product? Results?
Thanks again for all of the help. Sure makes this hobby enjoyable.September 1, 2018 at 11:04 pm #82138I have used the Indian Head a few times. I had a head gasket. On my 9.9 that leaked water very slightly on the right side. I used the Indian head after resurfacing the head a 2nd time , just on the perimeter of the outside mating surface of the water jacket area of the head along with a new head gasket. I know you are not supposed to use gasket sealer on head gaskets but I used very little and it cured the leak. I have used it on t stat gaskets once or twice also.
After being advised here to use BRP Gasket sealer, I use that now as my main sealant.
As for the copper based sealant, I wouldn’t use that as the copper will react with the aluminum , resulting in electrolysis between the dissimilar metals.
I do use that on car motors though. Both are very good sealants , but not for use on aluminum .
I hope other members will chime in with their opinions , which I would like to hear."Some people want to know how a watch works, others just want to know what time it is"
Robbie RobertsonSeptember 2, 2018 at 12:38 am #82139I concur with the recommendation to NOT use any gasket compound or anti-sieze product that contains copper due to it’s adverse reaction with aluminum in the presence of water or moisture. I have seen the Permatex Indian Head Shellac used but I prefer either BRP Gasket Seal Compound or Permatex Aviation Gasket Sealer #3 for sealing gaskets. I also use the same gasket seal compounds on cylinder head bolts, exhaust cover bolts or screws, lower unit attachment bolts and water pump fasteners to act as a thread sealer in lieu of using anti-sieze compounds. Some anti-sieze compounds also include graphite, copper or other dissimilar metals that will react with aluminum. I’m not intending to start another anti-sieze debate here – just my thoughts.
Bob
1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1957 Evinrude Fastwin 18
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."September 2, 2018 at 12:49 am #82141PSB,
Sorry but you definitely NEED sealer on head gaskets. Perhaps you are referring to not needing to when installing a new style gasket with the sealer already built in? Regardless, extra sealer wont hurt anything.
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