Re: Stus-List Landfall 38 3QM cooling system woes
- Original Message - From: Frederick G Street via CnC-List To: Bruce Whitmore via CnC-List Cc: Frederick G Street Sent: Friday, August 09, 2019 1:04 PM Subject: Stus-List Landfall 38 3QM cooling system woes Hello, all — I’ve got a 1979 LF38 with the original Yanmar 3QM diesel, fitted with a Sendure fresh-water exchanger kit (also original). Over the last season or so, I’ve been noticing a slow but accelerating drop in the coolant level. In the last month, it has sped up quite a lot. It’s not getting into the oil, and the head gasket is relatively new. With the recent acceleration, there’s also a lot of white smoke (steam) in the exhaust as well. I’m thinking the heat exchanger may have developed a leak (or leaks) between the fresh and raw water sides. I’m going to pull it this weekend and test it to see if that’s the case. I am also going to replace ALL coolant hoses (fresh and raw, including the loops to the water heater and the v-drive). I ordered 50 feet of 1/2” and 3/4” Gates green-stripe (off Amazon) to keep costs lower per foot and make sure I have enough; this may also allow me to perform a temporary fix in case the exchanger is toast, by completely bypassing the Sendure system and effectively making the engine raw-water cooled until I can decide what to do with the exchanger. This would also allow me to go on an extended weekend cruise next weekend without worry. BTW, so that I don’t have to try to size new belts for the engine, I’ll leave the add-on coolant pump in place, but remove the impeller and just let it freewheel for the temporary fix (with no hoses connected). It’s fairly new, I replaced it a few years ago. Anyone see any downsides to this plan; or any other places I can look for the missing coolant? 🙂 — Fred Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- Bayfield, WI -- ___ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray ___ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
Re: Stus-List Landfall 38 3QM cooling system woes
Fred: What is going to make the seawater circulate through the engine? Are you going to the raw water pump to circulate seawater through the engine’s cavity? I would think that the volume of seawater circulated would need to be greater than the antifreeze/water mixture normally in the closed cooling system since it is less efficient in heat exchange but there may be enough seawater that would be pumped by the raw water pump. You might find that the temperarture will run a little higher than normal. > On Aug 9, 2019, at 2:04 PM, Frederick G Street via CnC-List > wrote: > > Hello, all — I’ve got a 1979 LF38 with the original Yanmar 3QM diesel, fitted > with a Sendure fresh-water exchanger kit (also original). > > Over the last season or so, I’ve been noticing a slow but accelerating drop > in the coolant level. In the last month, it has sped up quite a lot. It’s > not getting into the oil, and the head gasket is relatively new. With the > recent acceleration, there’s also a lot of white smoke (steam) in the exhaust > as well. > > I’m thinking the heat exchanger may have developed a leak (or leaks) between > the fresh and raw water sides. I’m going to pull it this weekend and test it > to see if that’s the case. I am also going to replace ALL coolant hoses > (fresh and raw, including the loops to the water heater and the v-drive). I > ordered 50 feet of 1/2” and 3/4” Gates green-stripe (off Amazon) to keep > costs lower per foot and make sure I have enough; this may also allow me to > perform a temporary fix in case the exchanger is toast, by completely > bypassing the Sendure system and effectively making the engine raw-water > cooled until I can decide what to do with the exchanger. This would also > allow me to go on an extended weekend cruise next weekend without worry. > BTW, so that I don’t have to try to size new belts for the engine, I’ll leave > the add-on coolant pump in place, but remove the impeller and just let it > freewheel for the temporary fix (with no hoses connected). It’s fairly new, > I replaced it a few years ago. > > Anyone see any downsides to this plan; or any other places I can look for the > missing coolant? 🙂 > > — Fred > > > > Fred Street -- Minneapolis > S/V Oceanis (1979 C&C Landfall 38) -- Bayfield, WI > > ___ > > Thanks everyone for supporting this list with your contributions. Each and > every one is greatly appreciated. If you want to support the list - use > PayPal to send contribution -- https://www.paypal.me/stumurray > Robert Boyer s/v Rainy Days C&C Landfall 38, Hull #230 411 Walnut Street #11447 Green Cove Springs, FL 32043 (443) 994-1802 ___ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
Re: Stus-List Landfall 38 3QM cooling system woes
Bob — with the Sendure after-market cooling system, you end up with two pumps: the stock Yanmar pump on the engine which on my boat currently pumps coolant; and the add-on pump that on my boat currently pumps lake water. I would basically be bypassing the Sendure system with the add-on pump and heat exchanger, and converting back to the stock raw-water cooled system. In my case, that would be cold Lake Superior fresh water, so I’m not too worried about engine temp. This is how many C&C’s were delivered from the factory; with no coolant system, just raw seawater. — Fred Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- Bayfield, WI > On Aug 9, 2019, at 2:39 PM, Robert Boyer via CnC-List > wrote: > > Fred: > > What is going to make the seawater circulate through the engine? Are you > going to the raw water pump to circulate seawater through the engine’s > cavity? I would think that the volume of seawater circulated would need to > be greater than the antifreeze/water mixture normally in the closed cooling > system since it is less efficient in heat exchange but there may be enough > seawater that would be pumped by the raw water pump. You might find that the > temperarture will run a little higher than normal. > > >> On Aug 9, 2019, at 2:04 PM, Frederick G Street via CnC-List >> mailto:cnc-list@cnc-list.com>> wrote: >> >> Hello, all — I’ve got a 1979 LF38 with the original Yanmar 3QM diesel, >> fitted with a Sendure fresh-water exchanger kit (also original). >> >> Over the last season or so, I’ve been noticing a slow but accelerating drop >> in the coolant level. In the last month, it has sped up quite a lot. It’s >> not getting into the oil, and the head gasket is relatively new. With the >> recent acceleration, there’s also a lot of white smoke (steam) in the >> exhaust as well. >> >> I’m thinking the heat exchanger may have developed a leak (or leaks) between >> the fresh and raw water sides. I’m going to pull it this weekend and test >> it to see if that’s the case. I am also going to replace ALL coolant hoses >> (fresh and raw, including the loops to the water heater and the v-drive). I >> ordered 50 feet of 1/2” and 3/4” Gates green-stripe (off Amazon) to keep >> costs lower per foot and make sure I have enough; this may also allow me to >> perform a temporary fix in case the exchanger is toast, by completely >> bypassing the Sendure system and effectively making the engine raw-water >> cooled until I can decide what to do with the exchanger. This would also >> allow me to go on an extended weekend cruise next weekend without worry. >> BTW, so that I don’t have to try to size new belts for the engine, I’ll >> leave the add-on coolant pump in place, but remove the impeller and just let >> it freewheel for the temporary fix (with no hoses connected). It’s fairly >> new, I replaced it a few years ago. >> >> Anyone see any downsides to this plan; or any other places I can look for >> the missing coolant? 🙂 >> >> — Fred >> >> >> >> Fred Street -- Minneapolis >> S/V Oceanis (1979 C&C Landfall 38) -- Bayfield, WI ___ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
Re: Stus-List Landfall 38 3QM cooling system woes
Fred- A couple years ago I had an issue with my HX. Once I had it off, Walkie was able to pressure test it for me. That was in the middle of the winter and he didn’t have much going on. I don’t know what other options you have or if you’ve talked to him? It sounds like you’re going to purge all your anti freeze. What’s your choice to replace? Get Outlook for iOS On Fri, Aug 9, 2019 at 2:48 PM -0500, "Frederick G Street via CnC-List" wrote: Bob — with the Sendure after-market cooling system, you end up with two pumps: the stock Yanmar pump on the engine which on my boat currently pumps coolant; and the add-on pump that on my boat currently pumps lake water. I would basically be bypassing the Sendure system with the add-on pump and heat exchanger, and converting back to the stock raw-water cooled system. In my case, that would be cold Lake Superior fresh water, so I’m not too worried about engine temp. This is how many C&C’s were delivered from the factory; with no coolant system, just raw seawater. — Fred Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- Bayfield, WI On Aug 9, 2019, at 2:39 PM, Robert Boyer via CnC-List wrote: Fred: What is going to make the seawater circulate through the engine? Are you going to the raw water pump to circulate seawater through the engine’s cavity? I would think that the volume of seawater circulated would need to be greater than the antifreeze/water mixture normally in the closed cooling system since it is less efficient in heat exchange but there may be enough seawater that would be pumped by the raw water pump. You might find that the temperarture will run a little higher than normal. On Aug 9, 2019, at 2:04 PM, Frederick G Street via CnC-List wrote: Hello, all — I’ve got a 1979 LF38 with the original Yanmar 3QM diesel, fitted with a Sendure fresh-water exchanger kit (also original). Over the last season or so, I’ve been noticing a slow but accelerating drop in the coolant level. In the last month, it has sped up quite a lot. It’s not getting into the oil, and the head gasket is relatively new. With the recent acceleration, there’s also a lot of white smoke (steam) in the exhaust as well. I’m thinking the heat exchanger may have developed a leak (or leaks) between the fresh and raw water sides. I’m going to pull it this weekend and test it to see if that’s the case. I am also going to replace ALL coolant hoses (fresh and raw, including the loops to the water heater and the v-drive). I ordered 50 feet of 1/2” and 3/4” Gates green-stripe (off Amazon) to keep costs lower per foot and make sure I have enough; this may also allow me to perform a temporary fix in case the exchanger is toast, by completely bypassing the Sendure system and effectively making the engine raw-water cooled until I can decide what to do with the exchanger. This would also allow me to go on an extended weekend cruise next weekend without worry. BTW, so that I don’t have to try to size new belts for the engine, I’ll leave the add-on coolant pump in place, but remove the impeller and just let it freewheel for the temporary fix (with no hoses connected). It’s fairly new, I replaced it a few years ago. Anyone see any downsides to this plan; or any other places I can look for the missing coolant? 🙂 — Fred Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- Bayfield, WI ___ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
Re: Stus-List Landfall 38 3QM cooling system woes
Hi, Pete — how was the Trans Superior? No, I haven’t spoken with Walkie yet (for the listers who don’t know him, he’s the local diesel guru up here; his dad runs dieselenginetrader.com). What was the result of your heat-exchanger testing? Yes, I’ll have to purge the coolant; if I go raw-water for now, I won’t need any… 🙂 If I end up repairing/replacing the exchanger, I’ll be replacing with Prestone green like the existing. Or were you asking about replacing the exchanger?? — Fred Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- Bayfield, WI > On Aug 9, 2019, at 3:03 PM, Pete Shelquist-comcast > wrote: > > Fred- > A couple years ago I had an issue with my HX. Once I had it off, Walkie was > able to pressure test it for me. That was in the middle of the winter and > he didn’t have much going on. I don’t know what other options you have or if > you’ve talked to him? > > It sounds like you’re going to purge all your anti freeze. What’s your > choice to replace? ___ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
