JumbleDuck
Well-Known Member
I think my raw-water cooled 1GM10 has four 'oles in the 'ead, but only three in the flange. I just went out into the garden to find the old head and check, but it's buried somewhere under a foot of snow.
yanmar exhaust elbow. beware!
- Thread starter Spyro
- Start date
I think my raw-water cooled 1GM10 has four 'oles in the 'ead, but only three in the flange. I just went out into the garden to find the old head and check, but it's buried somewhere under a foot of snow.
Spyro
Well-Known Member
From what I gather it's the same manifold whether fresh or raw water cooled. It's a different elbow depending on the model. 3 bolts for raw. 4 for fresh.
Appledore
Well-Known Member
Checking today, I'm not sure if they are still there, but here's the details:
Ards Stainless Marine
Unit 1, Copeland Marina,
Donaghadee, BT12 0HE
Tel: 07774977469 or perhaps 028 4277 1179
The person was Alex Dugan - very helpful.
Tried the 2 'phone numbers this morning, but no reply.
JumbleDuck
Well-Known Member
Now checked. Four holes in the head. I can't see why they didn't give the elbow a four-hole flange.
Spyro
Well-Known Member
Just to confuse us.
Old Troll
Well-Known Member
Went down to boat yesterday to remove and check the exhaust manifold on my Yanmar 1GM10, last checked four years ago, and found all okay. Gave it a wash and blow dry and put back on. I have owned the boat/engine for approx ten years and when I spoke to the previous owners who had the engine installed in 1994 they had no recollection of ever having replaced this exhaust manifod. Not trying to say there is not a problem, but not a reason for over reaction either.
Mel
Well-Known Member
Pictures of 1GM10 cylinder head - Direct cooled
From my engine circa early 1990's
From my engine circa early 1990's
TeamSpirit
Well-Known Member
Looked fine in situ but this fell apart when I tried to take it apart for closer inspection. (see previous post)
Is their any manufactures out there who has produced this 'U' style cooling elbow? other than yanmar !
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rob2
Well-Known Member
I'm sure you know that that is the optional "Hi-rise" elbow for engine installations below the water level. Most engine marinisers supply a version of this as an option.
Rob.
Rob.
Spyro
Well-Known Member
Plenty on ebay, search yanmar exhaust http://www.ebay.com/itm/Yanmar-Dies..._Accessories_Gear&hash=item27f5865803&vxp=mtr
earlybird
Well-Known Member
If the photo and the ebay items are the same things, the boss for the water injection point seems to be on the upstream side of the 180 deg elbow. Or am I missing something?
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Spyro
Well-Known Member
New Elbow arrived yesterday 9 days after ordering from www.exhaustelbow.com. Hope it performs as good as it looks. Had to pay the post office £11.80 for customs and handling that on top of the £77 for the elbow is not too bad compared to the Yanmar price.
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KevO
Well-Known Member
Ordered mine from Ben on Fri 6th last week. Arrived today, nothing to pay on import, happy, happy, happy! :encouragement:
KAM
Well-Known Member
Spyro do you have a photo of the failed elbow looking from the flange end. I currently have mine stripped down. Its done 700 hours over 7 years. I was expecting to see some sign of corrosion where the cooling water impinges on the inner tube but it looks pristine. The only visible sign of damage is very slight pitting on the engine exhaust side but well away from the heat effected zone of the weld. The welding looks like semi automatic TIG. This type of weld is often done without using filler wire. If the tubes are not held in the correct position in the welding fixture it is possible to finish up with a weld which looks perfect but only has a paper thin area of fused metal. The second type of defect is lack of root fusion which would leave a very narrow circumferential gap which could promote corrosion cracking and eventual failure due to vibration. Its possible that there are a limited quantity of elbows in service with weld defects, causing the observed failure, rather than an overall design or quality problem. The workshop manual does however say clean and check this item every 250 hours and repair any cracks or damage by welding.
Old Troll
Well-Known Member
Yanmar Exhaust Elbow
I too have similiar experience of the exhaust elbow showing only minor wear and tear on having been checked after nine years running of at least 100 hours per season.. Indeed I have reason to believe that the elbow is the original since engine instalation in 1994.
I too have similiar experience of the exhaust elbow showing only minor wear and tear on having been checked after nine years running of at least 100 hours per season.. Indeed I have reason to believe that the elbow is the original since engine instalation in 1994.
Spyro
Well-Known Member
Sorry Idon't have a picture. Just threw out the old elbow this week.
LunaSea
New Member
Today we removed mixer elbow because of leak. Yanmar Engine 3YM30 manufactured 2010. Engine Hours 907 in Jeanneau 36i. On the mounting plate of elbow is stamped:'0904', and possibly a 'W' etched on it.
Weld of tube to plate is visibly cracked, but no evidence of leak. (I plugged salt water port and filled outer tube to top of inner tube with boiling water- no leak.)
More troubling is the concavity of the mounting plate, particularly between the two lower/bottom mounting holes. I think this is the problem. Have you seen or heard of anything like this before?
Thank you for the many posts and any assistance you may offer. Lori
PS we will try to send images. We are new to this forum.
Weld of tube to plate is visibly cracked, but no evidence of leak. (I plugged salt water port and filled outer tube to top of inner tube with boiling water- no leak.)
More troubling is the concavity of the mounting plate, particularly between the two lower/bottom mounting holes. I think this is the problem. Have you seen or heard of anything like this before?
Thank you for the many posts and any assistance you may offer. Lori
PS we will try to send images. We are new to this forum.
cliveshelton
Well-Known Member
Had the same problem over the winter. See here..............http://www.ybw.com/forums/showthread.php?421692-3YM30-exhaust-elbow-gasket&highlight=
Change the elbow in any case. I had to and it is a common problem apparently for them to leak. I also had the heat exchanger removed and its mounting plate/surface skimmed and the studs renewed. Time will tell if that did the trick long-term.
Check that the drips have not affected the electrics below the exhaust elbow.
Good luck.
Change the elbow in any case. I had to and it is a common problem apparently for them to leak. I also had the heat exchanger removed and its mounting plate/surface skimmed and the studs renewed. Time will tell if that did the trick long-term.
Check that the drips have not affected the electrics below the exhaust elbow.
Good luck.
MagicalArmchair
Well-Known Member
Ee gads, I had best check my elbow - had the boat ten years and never had it off. Engine fires as sweet as a nut every time (2GM20)... time to get my spanners out (I updated my servicing page too with the excellent DIY video earlier in this post http://www.albinballad.co.uk/about-the-albin-ballad/yanmar-2gm20-engine-winterising-and-service).
Thanks for posting!
Thanks for posting!
RichardS
N/A
Welcome to the forum LunaSea.
I'm going to check my 3YM30 elbows this summer. Engines are 2008 but both run smoothly so hoping it's all OK.
One question ........ I can see how a concave area between the manifold studs might lead to exhaust gas escaping but how could water escape through the gap as the water injection point into the elbow is downstream of the flange. Perhaps when the engine is stopped a little water might run out from the injection point once the exhaust gases have ceased flowing but this would be a tiny amount as the impelller has also stopped turning.
Richard