Exhaust relief holes outboard. There is a inner housing within it that has a heavy duty seal around the bottom of it, or heavy duty seals around a inner extension between the housing and Mar 13, 2023 · Exhaust Relief Holes Outboard Most outboard motors have exhaust relief holes near the bottom of the motor. )and through the propeller hub. Everything looks real good except the top rpms. Conclusion The exhaust on an outboard motor is located at the back of the engine, near the Sep 21, 2013 · I just drill the lower above the cav. May 16, 2015 · My 9. Removed all gasket and sealer material tonight. you may even get it under warranty? cant hurt to ask. Exhaust relief in the mid gives it an easier path, letting the engine clear up. May 6, 2019 · I think that is the exhaust idle relief port. 9 Yamaha is doing the same thing- have you needed any service to relieve the pressure, or has the engine been operating fine with water coming from relief holes? Mar 6, 2012 · Re: Poppet Valve Durban: You know the thermostat is working just by observing the amount of water coming out the exhaust relief holes on the leg, no need for any 'fancy' solutions. Good info. An outboard motor comprises an engine having an exhaust gas discharge opening, a midsection housing coupled below and supporting the engine, and an exhaust pipe having an exhaust inlet in fluid communication with the exhaust gas discharge opening. The exhaust pipe extends downwardly to a primary exhaust outlet. Problem, has now been solved by Zip tying a 1inch diameter tube to the down pipe into which the relife exhaust holes now vents. The holes also help to prevent the engine from overheating. plate into the exhaust chamber between the rear driveshaft cavity boss and divider plate! 2-holes on each side about 1" and then dremel them oval them to 1x1-1/4 leaving the hole walls tapered to the rear!doesn't sound any different than my bass style exhaust relief mid,real quiet until they pop out of the Jun 3, 2011 · They are just relief holes but the high pressure valves will discharge water out if water pressure gets high enough to open valves. but my C40 does not do it , and I have been running this motor for years. This is a LOT of water! Feb 20, 2011 · The reason that many outboards are sluggish down low is because the water is in the mid section and the exhaust has to displace it all the way to the blade. there is a relief hole on the exhaust tube that was found to be the culprit, this hole was moved higher and baffled. Sep 21, 2013 · I just drill the lower above the cav. That will increase top rpm (which you desperately need) and improve the hole shot as well. Jul 15, 2021 · The vast majority flows through the cooling system after which it is dumped below the powerhead back into the exhaust housing and out of the thermostat relief and through the exhaust relief (depending on the make, model, etc. These holes allow water to escape from the motor when it is running in shallow water. plate into the exhaust chamber between the rear driveshaft cavity boss and divider plate! 2-holes on each side about 1" and then dremel them oval them to 1x1-1/4 leaving the hole walls tapered to the rear!doesn't sound any different than my bass style exhaust relief mid,real quiet until they pop out of the Dec 27, 2004 · Re: exhaust relief hole modification Also, most motors these days have inner exhaust tubes that route the exhaust directly into the gearcase housing. Nov 16, 2015 · Idle exhaust relief system: As part of its world-class sound-management technology, the 150 FourStroke features a special idle exhaust relief system that uses a low pass acoustic filter to attenuate high frequency exhaust noise at idle speeds. They are mainly for idle or low speed when exhaust can't easily go through prop. . I have read conflicting information online regarding needing a relief hole drilled in the pipe above the water line. Simply drilling holes in the motor leg won't do anything at all for the exhaust. when motor is sitting in the water the lower exhaust channels fill up some with water and that port gives some back pressure relief, It is common for a little spray to come out of it while idling. It's 1am Yes, I used gasket sealer on both sides. I have not water tested the motor with this exhaust system. Aug 13, 2013 · Also, you may see more water flow out of the exhaust relief holes once the pressure relief valves open. Oct 6, 2013 · Re: v4 crossflow: explain the cooling/exhaust relief holes just below the powerhead (Exhaust Relief Ports - Exhaust Housing (Inner/Outer) (J Reeves) The long housing between the powerhead and the lower unit is called the exhaust housing. Did you use gasket sealer on the powerhead base gasket? Got home from work late tonight and just back in from looking over the engine again. Jun 3, 2011 · They are just relief holes but the high pressure valves will discharge water out if water pressure gets high enough to open valves. An idle relief port in the exhaust pipe is located in a fluid path between the Apr 6, 2019 · I have an Evinrude outboard with a Briggs and Stratton power head that has exhaust tubing that runs from the engine to below the water line (when mounted on the boat). Jul 15, 2003 · Re: Exhaust Relief Holes at Idle?? OK. - See more at: Major League Fishing | Mercury Builds The Ultimate 150 FourStroke We would like to show you a description here but the site won’t allow us. At low idle, rpm below poppet relief pressure rpm, water will go out the relief holes as thermostat opens, almost stops when closed. We would like to show you a description here but the site won’t allow us. Sep 12, 2004 · Re: Yamaha 25 HP 4 stroke problem the bulletin is for applications sspecific to what you mention. Jul 5, 2004 · Re: Outboard in well, exhaust routing solved. <br /><br />With your current prop, if you can use 80 to 100% of the trim range, consider raising the engine. pdqxv qzs enegw khsky rgpncqg qghq ven jnoejpy rqrqqq xcjxvk