游艇百科
Engine antifreeze
Engine antifreeze on sailing yachts: closed and raw-water winter protection, survey questions, and FairHelm limits on guessing mix strength from a receipt photo.
这是什么
Engine antifreeze on yachts means coolant or winterising fluid used in the closed cooling circuit and, for winter layup, often a non-toxic antifreeze flush through raw-water passages so ice cannot crack the block, cooler, or exhaust elbow.
Anchor
Freshwater-cooled diesels FairHelm meets still need raw-water side protection in hard frosts if water remains. Saildrive and shaft boats share the freeze risk in heat exchangers and elbows. Yard tickets that say "antifreeze" without circuit detail are incomplete.
FairHelm judgment
FairHelm judgment: cracked elbows and frozen heat exchangers after a "winterised" claim are negotiation bombs. Ask closed-circuit service history and raw-water winter method separately. A pink puddle under the boat is not a concentration certificate.
Limits
We do not invent mix ratios as universal law. Follow the engine maker and the product label for that diesel. Toxicity and bilge discharge rules apply locally.
常见问题
Q: Is automotive coolant fine in raw-water winterising?
A: Often yards use propylene-glycol winterising fluid for raw water. Do not invent a mix; follow yard and maker guidance.
Q: Does closed-circuit coolant alone protect everything?
A: No. Raw-water paths can still freeze if left wet.
Q: Can I read protection from colour alone?
A: No. Colour is brand dye. Concentration needs proper check.