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  1. Augoose

    Volvo Penta 5.0 GL valve cover leak

    Thanks all. I ended up installing Fel-pro's performance cork gaskets, part # 1648. They were a few mm's thicker and being rigid, stayed in the valve cover channel far better than the blue silicone ones. Seems another example of you get what you pay for as they were 3x as expensive. Cleaned all...
  2. Augoose

    Volvo Penta 5.0 GL valve cover leak

    Thanks all. The valve cover is as I said new but I'll check it for flatness and the internal lip. Interesting that I'm having trouble not only with my OEM cover but this brand new cover as well, and only on this side of the engine. The gasket I was using was Fel-Pro's blue silicone. Possibly the...
  3. Augoose

    Volvo Penta 5.0 GL valve cover leak

    All, I've recently installed two new heads on my 5.0GL following an overheat. I'm getting a persistent valve cover leak on the starboard side rear edge of the valve cover. Using new Fel-Pro rubber gaskets torqued per service manual. Leaked with old valve cover and I just replaced my OEM cover...
  4. Augoose

    '99 Volvo Penta 5.0 GL valve cover leak question

    Just to follow up on this thread, I tried using the great suggestions of plumber's putty to identify clearance issues and swapping covers around and after some adjustment, the original cover sat better but still not completely down on the head. I thought valve covers were all the same but it...
  5. Augoose

    '99 Volvo Penta 5.0 GL valve cover leak question

    I didn't as that valve cover has the oil fill hole and cap in the front. I inadvertently wrote port side in my original post but it is indeed the starboard side valve cover. I will flip it around and see if it sits down level. Thx!
  6. Augoose

    '99 Volvo Penta 5.0 GL valve cover leak question

    I'll try that, thanks!
  7. Augoose

    '99 Volvo Penta 5.0 GL valve cover leak question

    All, I recently finished installing new aftermarket heads from Marine Engines 4 less. On the port side of the engine my original OEM valve cover is not sitting flush and I'm leaking oil from the lowest corner at the aft end of the cover. I used an endoscope and I can see a 1-2mm gap between the...
  8. Augoose

    Volvo Penta 5.0 GL PWTR - severe overheat - thought I was on fire - troubleshooting Questions

    Ran for 20 mins on dual sided muffs, no overheating and ran great! Thanks all for the help!!! Case closed. I hope........
  9. Augoose

    Volvo Penta 5.0 GL PWTR - severe overheat - thought I was on fire - troubleshooting Questions

    Hey guess what happens when you rush? You make mistakes of course.......so when I put the wiring harness back on after reinstalling the heads, I inadvertently had the harness leads (purple + black) to the coil reversed. The leads from the coil to the distributor were correct. So looking back...
  10. Augoose

    Volvo Penta 5.0 GL PWTR - severe overheat - thought I was on fire - troubleshooting Questions

    Thanks ESGWheel, I keep hoping for some good luck! I suppose since my compression numbers are good the new heads are likely fine, so I need to stop worrying about water getting in and focus on the current symptoms. Had I not just put new heads on and had an overheat, I'd be focusing on spark at...
  11. Augoose

    Volvo Penta 5.0 GL PWTR - severe overheat - thought I was on fire - troubleshooting Questions

    Another update - I replaced my non-oem impeller with an OEM one and took it to the ramp. Temps never got above 175F and manifolds stayed cool. Boat idled well at the dock so I meandered around for about 10 minutes at about 1,500 rpms. All was well until it wasn't......motor suddenly died...
  12. Augoose

    Volvo Penta 5.0 GL PWTR - severe overheat - thought I was on fire - troubleshooting Questions

    Thanks Lou. The impeller is new and the muffs fit very tightly. Three weeks ago when we tested the boat in the water (when head gaskets completely failed) the gauge on the dash appeared to show almost 210 before all of a sudden the engine temp dropped drastically down to 160 or so. At that time...
  13. Augoose

    Volvo Penta 5.0 GL PWTR - severe overheat - thought I was on fire - troubleshooting Questions

    Ok, here's the update. I finished installing new cylinder heads with all new gaskets on all associated components, new temp sending unit, new temp gauge, and a new 160 degree thermostat. I started the boat on muffs at idle and it sounds good. I bought an Amazon laser temp gauge and took readings...
  14. Augoose

    Volvo Penta 5.0 GL PWTR - severe overheat - thought I was on fire - troubleshooting Questions

    Thanks Sir. I did order head gaskets based off the VP part number, so I should be good there. Unfortunately the remanufactured heads from Jegs won't ship from the manufacturer until July 29th, so I'm not waiting for that. I can't find any other remanufactured options online so I'm inclined to...
  15. Augoose

    Volvo Penta 5.0 GL PWTR - severe overheat - thought I was on fire - troubleshooting Questions

    Perfect thank you sir. I'm leaning towards the remanufactured solution
  16. Augoose

    Volvo Penta 5.0 GL PWTR - severe overheat - thought I was on fire - troubleshooting Questions

    Alternatively Jegs offers remanufactured automotive heads - https://www.jegs.com/i/ATK-Engines/059/2CM2/10002/-1 I've read that the valves and springs for an automotive setup are not heavy enough and designed for the way marine motors are run - anyone have an opinion on this?
  17. Augoose

    Volvo Penta 5.0 GL PWTR - severe overheat - thought I was on fire - troubleshooting Questions

    Opinions on quality of heads from Marine Engines 4 less? They seem to have good reviews online. Aftermarket - https://marineengines4less.com/5-0l-gm-vortec-marine-engine-cylinder-head-replaces-mercruiser-volvo-penta-applications-years-1997-newer/ They don't offer a remanufactured option in...
  18. Augoose

    Volvo Penta 5.0 GL PWTR - severe overheat - thought I was on fire - troubleshooting Questions

    Thanks. My plan is to sell the boat once it is repaired, proven reliable and running well as I'm already purchasing a new-to-me used boat. I will not pass on a problem to someone else, so I'm trying to choose from a few reasonable options to repair it. Now that I found that crack, continuing...
  19. Augoose

    Volvo Penta 5.0 GL PWTR - severe overheat - thought I was on fire - troubleshooting Questions

    Thanks all. I will look into the magnaflux service. I sprayed wd-40 over everything to keep the rust down while I wait on gaskets, so I suppose I'll need to get that cleaned off before testing. Great point about the exhaust ports in the center. My metal straight edge seemed to slide right across...
  20. Augoose

    Volvo Penta 5.0 GL PWTR - severe overheat - thought I was on fire - troubleshooting Questions

    First and on today I give thanks to all those who gave the ultimate sacrifice (SGT Mitchell, I miss you bud) - your dedication to the country will never be forgotten. I hope everyone is safe and well. With that said, I removed both cylinder heads today. The cylinders themselves look good with...
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