Start to Finish: Building Our 50' Skater
04-18-2018 | 01:17 PM
#1704
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Joined: Jan 2003
Posts: 2,630
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From: Joplin, Mo
Pistons:
When we ran the boat at Lake Havasu a few weeks ago one of the engines started making a little bit different noise and had more blow by then the other. Every time we have ran the boat it has been in really cold water. At the lake in Michigan it was 34' outside and 35' water temp. At Jordanelle reservoir it was 36' outside and 32' water temp, and at lake Havasu it was 60' outside and 55' water temp. The engines do not have closed cooling so they are getting continuous cold water and the blocks are not getting warm, maybe up to 100 degrees. So we think the pistons are swelling in the bore and the block is not getting warm enough to grow so the pistons are expanding and grabbing the side walls. Now I need to figure out a way to use a thermostat to have the water circulate in the engine till it gets warm and then let the raw water start coming in to cool it. Something like a merc 1075 uses? Any ideas?
On another note, the top of the piston looks basically new. No real signs of melting, ect. and we ran them really hot a few times.
When we ran the boat at Lake Havasu a few weeks ago one of the engines started making a little bit different noise and had more blow by then the other. Every time we have ran the boat it has been in really cold water. At the lake in Michigan it was 34' outside and 35' water temp. At Jordanelle reservoir it was 36' outside and 32' water temp, and at lake Havasu it was 60' outside and 55' water temp. The engines do not have closed cooling so they are getting continuous cold water and the blocks are not getting warm, maybe up to 100 degrees. So we think the pistons are swelling in the bore and the block is not getting warm enough to grow so the pistons are expanding and grabbing the side walls. Now I need to figure out a way to use a thermostat to have the water circulate in the engine till it gets warm and then let the raw water start coming in to cool it. Something like a merc 1075 uses? Any ideas?
On another note, the top of the piston looks basically new. No real signs of melting, ect. and we ran them really hot a few times.
04-18-2018 | 01:43 PM
#1705
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Joined: Jan 2010
Posts: 346
Likes: 877
From: Finland
Thermostat is must in cold conditions, but it should be circulated. When thermostat closed, full flow trough engine is needed. Three way thermostat is way to go. For example this
https://www.totalparts.nl/eng/truck-...2016-2017-2018
scania part numbers 1381494 1381494. Bigger fittings are two inch dia. Simple put anywhere between
https://www.truckparts1919.com/media...-5058452_2.jpg
It have two step double thermostat inside. First is lower temp and shut circulating flow and open cold flow. If flow is not enough and temp rise, another thermostat open and double the flow.
https://www.totalparts.nl/eng/truck-...2016-2017-2018
scania part numbers 1381494 1381494. Bigger fittings are two inch dia. Simple put anywhere between
https://www.truckparts1919.com/media...-5058452_2.jpg
It have two step double thermostat inside. First is lower temp and shut circulating flow and open cold flow. If flow is not enough and temp rise, another thermostat open and double the flow.
Last edited by ksalmine; 04-18-2018 at 01:55 PM. Reason: Pictures doesn't show
04-18-2018 | 01:45 PM
#1706
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Joined: Apr 2004
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From: 29°50'49.74"N 95° 5'17.55"W.......TEXAS
Closed cooling and regulate outside water flow to water/coolant exchanger. This would have the added benefit of reducing hot spots due to air pockets and corrosion. Maybe one exchanger to service both engines?
Last edited by Wobble; 04-18-2018 at 01:55 PM.
04-18-2018 | 02:34 PM
#1707
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Joined: Jan 2003
Posts: 2,630
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From: Joplin, Mo
We do not want to do closed cooling due to the weight and size needed to cool this much hp.
04-18-2018 | 02:37 PM
#1708
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Joined: Aug 2011
Posts: 570
Likes: 46
From: 812 - MS - LOTO 4mm
Check out this website Tyson - I've had these on my trucks for many years - they work great! If you look close at the attached pic, you can see them about flush with the bottom of the body. I can get you close up pictures of them on my truck if you'd like.
Browse Our Wholesale Truck Accessories at AMP Research
04-18-2018 | 02:40 PM
#1709
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Joined: Jan 2003
Posts: 2,630
Likes: 79
From: Joplin, Mo
Something like this? Thermostat with a bypass. Use the stock water pump to circulate the water till it’s warm and then the bypass opens and the raw water will go through the engine.
Last edited by BigSilverCat; 04-18-2018 at 02:49 PM.
04-18-2018 | 03:02 PM
#1710
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Joined: Apr 2004
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From: 29°50'49.74"N 95° 5'17.55"W.......TEXAS
There are surely lighter solutions than those you would see on a marine CAT
