Back in the (good/bad) old days, I used to wrap fiberglass tape on the headers and exhaust of my motorcycle to keep from frying my legs. I have a Hunter 376 with the original Yanmar 3JH2E (E= no blower). I recently replaced the mixing elbow and some exhaust parts, the originals were rusted, painted over, rusted, painted over, and finally sprayed with some aluminum-looking goop. All nice shiny new parts now, but the engine compartment is a bit hotter - evidently 10 layers of rust, paint and goop provided some insulating value. I was thinking about wrapping the hot parts with the old fashioned header insulation, so when I get thrown into the hot parts when I'm trying to fix a leaky hose clamp in a storm, I won't get fried. (Hose clamps only leak in a storm, right?) I'd be interested in hearing whether anyone has done this on their diesel, and any advantages or disadvantages. Thanks, -Beth
Any advantage to using fiberglass wrap on Yanmar diesel exhaust?
- Thread starter bmohr
- Start date
The only "bad" aspect that comes to mind is the potential to increase corrosion and it being "invisible" under the insulation. The corrosion in salt water is more exacerbated than running motorcycles on land.
As to hose clamps breaking or leaking, are you using solid clamps? Or the more common ones with the open slots in them? (Sorry, don't recall the names of these two different clamps) I would work on changing all critical clamps to the solid ones - much better clamps...
dj
As to hose clamps breaking or leaking, are you using solid clamps? Or the more common ones with the open slots in them? (Sorry, don't recall the names of these two different clamps) I would work on changing all critical clamps to the solid ones - much better clamps...
dj
jssailem
SBO Weather and Forecasting Forum Jim & John
- Oct 22, 2014
- 22,740
My boat came with the wrap on the mixing elbow. I attempted to unwrap it once just so I could examine the condition of the elbow when I had removed it. I quickly gave up the attempt and left it in place. I'm not sure how one can examine the exterior of the elbow with the wrap on it. BTW, at first glance it looked like aluminum foil so I thought it could be removed easily. I'm guessing that it would have to be cut off with a grinding wheel or something.
jssailem
SBO Weather and Forecasting Forum Jim & John
- Oct 22, 2014
- 22,740
I had wrap on my exhaust system when I disassembled my engine. It took a sharp knife that ended up dull to cut away the paint covered wrap. Now the wrap is secured with stainless steel wire. It is over the exhaust SS pipe up to the water insertion. Then the exhaust hose begins managing the now water cooled exhaust to the stern tube.
I'll have to see how this all works out.
I'll have to see how this all works out.
There is absolutely NO reason for you to have done that.
You don't have a mixing elbow, you have an exhaust riser. The ONLY place an exhaust riser on most all Catalinas with non-Yanmar engines fails is at the nipple where the exhaust water enters the riser just before the muffler.
Here's a picture of your riser and a discussion of the wrap. The new wrap is somewhat different than OEM, but same concept.
Exhaust Riser C-320
Catalina Direct, publishers of the Catalina 22 and Catalina 25 Owner's Handbooks and the largest supplier of parts and Lewmar winches for Catalina Yachts in the country
www.catalinadirect.com
What have I done? I pulled off my mixing elbow and put it back on - that's it. Your comment makes no sense ... my Catalina 320 has a YANMAR 3GM30F engine (as do the great majority of Cat 320's, I believe)... so obviously it's not a "non-Yanmar" engine.There is absolutely NO reason for you to have done that.
You don't have a mixing elbow, you have an exhaust riser. The ONLY place an exhaust riser on most all Catalinas with non-Yanmar engines fails is at the nipple where the exhaust water enters the riser just before the muffler.
Here's a picture of your riser and a discussion of the wrap. The new wrap is somewhat different than OEM, but same concept.
Exhaust Riser C-320
Catalina Direct, publishers of the Catalina 22 and Catalina 25 Owner's Handbooks and the largest supplier of parts and Lewmar winches for Catalina Yachts in the country
If you want to quibble about calling it an "exhaust riser" have at it. Yanmar 3GM30F Mixing Elbow and Overheating As far as I know most folks call it a mixing elbow (even though "elbows" come in a variety shapes).
I wasn't looking for a stainless steel exhaust riser so what was the point of the reference?
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Then of course it makes sense, but you have a Yanmar engine. Sorry I thought you didn't. How were we supposed to know? I did qualify my comment clearly.
The water injection elbow on a 3JH2E is pretty compact I don't think there would be any significant advantage to wrapping it with fiberglass tape. It is quite unlike the injection riser @Stu Jackson or @Scott T-Bird referenced.
hdimarine.net
GM2-JHB Stainless Steel Mixing Elbow - HDI Marine
This HDI Marine Item Replaces Yanmar P/N 129198-13500
hdimarine.net
Well, in any case, the exhaust riser that you referenced is the replacement part for the "elbow" on my boat. The photo below shows the wrap I found and didn't bother to remove once I tried and failed. It looked simply like foil to me, but once I had a closer look, I found that it was not going to come off easily. So, I left well enough alone. I didn't have any particular reason for removing it, other than it looks somewhat janky to me.
Attachments
Janky or not, that section of the riser will get very hot upwards of 800° F because the cooling water is injected after the loop. On the 3JH2E the cooling water is injected at the top of the loop and the whole unit is less than 4" x4" so it stays relatively cooler.
Right, I took the riser off mainly because I wanted to see the inside of the pipe. Not being familiar with the insulation, I thought the wrap was merely multiple layers of aluminum foil. Finding that it was insulation and seeing that the inside of the pipe wasn't clogged, I simply put the riser back on just as it was.
how about this solution.
Removable Engine and Generator Exhaust System Blankets Covers
USCG approved.
Jim...
Removable Engine and Generator Exhaust System Blankets Covers
USCG approved.
Jim...
I have something similar for the diesel boiler for my heating system.how about this solution.
Removable Engine and Generator Exhaust System Blankets Covers
USCG approved.
Jim...