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Old 23-05-2011, 11:10   #16
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Re: Mixing Elbow Scheduled Replacement ?

an alternative is to fabricate a replacement from heavy wall (sch 80) steel pipe and galvanise it. This will last almost as long as the proprietary replacements.
Problem with fabricating most of the stainless steels is that the nasty mix of temperature, sulphur and chlorides is very corrosive, particularly to the welds. That is why OEM exhaust mixers are typically cast.
Re valve clearances - I think not doing this is more bad habit than anything - I remember many moons ago when we checked the clearances on my father's old marinised Ford tractor diesel all were out of spec and one adjusting screw broke off.
Dockhead - with your Porsche why not do what the Subaru crowd do and pull the whole engine out to set the clearances!
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Old 23-05-2011, 11:21   #17
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Re: Mixing Elbow Scheduled Replacement ?

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Originally Posted by Marinheiro View Post
Dockhead - with your Porsche why not do what the Subaru crowd do and pull the whole engine out to set the clearances!
That's not really as silly as it sounds -- the 911 engine comes out quite easily. I had a series of throwout bearing plastic bushes break (before I figured out that I had the clutch cable improperly adjusted) and got to where I could have the motor out single-handed in about half an hour.

Putting it back in took a little longer, however.

But wait, I thought Subarus had hydraulic lifters?!
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Old 23-05-2011, 12:30   #18
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Re: Mixing Elbow Scheduled Replacement ?

You could do what I did and wait till it leaks. Then you get to buy a new head valves, etc...as well as a new elbow.. And don't forget the fun learning experience you'll get putting it all right. Believe them when they say replace it!
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Old 23-05-2011, 12:45   #19
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Re: Mixing Elbow Scheduled Replacement ?

Dockhead - on the side Subarus had hydraulic lifters for a while then went back to bucket type, strange decision
Your query re exhaust mixer reminds me of my power boat days - I had a horizontal turbo'd 6-354 Perkins. When the mixer let go (this was in Australia) rang the local dealer who said yes he had one gathering dust and it would be $500, I said that was bit steep, he replied the list price was $3500 - I responded the $500 model would be just great!
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Old 23-05-2011, 12:49   #20
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Re: Mixing Elbow Scheduled Replacement ?

I think the issue is the risk of getting poisoned by a leaking one.

Judging from the damage I have seen on our boat I would say - replace regularly. When you take it off and clean you will see how much is gone and this will take you and indication of when to change yours.

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Old 23-05-2011, 13:18   #21
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Re: Mixing Elbow Scheduled Replacement ?

I have a 3JH3CE and replaced both of my elbows because they were leaking water at the weld. These are the thin stainless version that comes standard on Yanmar's. I had them welded but they only lasted a couple of months. The welder warned me that the welding would cause corrosion issues which is why the original weld rusted through and it did. These things list for about $350 so they are no fun to replace. I did find a little secret though. Many people want or need differently shapes or different materials than the standard elbows that come on new engines. The shops take off the stock elbows, but they can't sell them as new. These get sold as takeoffs rather than used, because they have in fact never been used. I bought four of them for $300. Check and see if any engine shops have takeoffs before you pay full price for the elbows. I got mine at Torrensen, but I'm sure others have them too. They're not always available so you have to watch for them. Torrensen list the under the same part number with a "TO" on the end. They're kind of hard to find on the web site so the easiest thing to do is to find you listed part number and do a search adding a "TO" to the end of the part number. Good luck
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Old 23-05-2011, 13:43   #22
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Re: Mixing Elbow Scheduled Replacement ?

More comments and information on this topic in a thread I started a few years ago:
Exhaust Mixing Elbow Inspections

Cheers,
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