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    yamaha 3.0 l4 blew head gasket help!

    Is the engine circulating pump the one under the thermostat housing to the left of it actually. Runs off a belt from the pulley I haven’t checked either this one or the raw water pump not sure where that one is. I wasn’t having an issue with either when it blew head gasket it was from bad...
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    yamaha 3.0 l4 blew head gasket help!

    I was able to make my riser gasket. I’m looking for a diagram of the throttle linkage coming up from under the engine not sure how it’s supposed to go into the y piece mounted on manifold. Does it snap in and lock in place and if so where does the black rubber piece go into relation to the...
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    yamaha 3.0 l4 blew head gasket help!

    I've pretty much found everything gasket wise except for the riser elbow gasket its metal or something similar and its virtually non existent i have called , texted and emailed dozens of shops ,dealers and e bays sellers and no one can find the right gasket. i ordered 3 of them and they...
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    yamaha 3.0 l4 blew head gasket help!

    I found the thermostat gasket and it is paper so I could just make one. My biggest obstacle has been trying to find the exhaust elbow riser gasket. I’ve had people searching tried , eBay companies , wholesale marine , I boat , crowleys. Etc etc. cannot find the gasket they are all a little...
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    yamaha 3.0 l4 blew head gasket help!

    Thanks for the updated info. I will pull the outdrive and check the impeller. I found a kit that was OMC cobra that will work I’m told. My AZ local store is ordering me the thermostat so I’m just waiting on that & gaskets now. The thermostat gasket is something I’ve not been able to find...
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    yamaha 3.0 l4 blew head gasket help!

    I was able to get a low hours head , manifold with riser and even a xtra lower outdrive assembly
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    yamaha 3.0 l4 blew head gasket help!

    I went by the industrial engine manual and the Yamaha publication also stated 90 lbs is that not correct.
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    yamaha 3.0 l4 blew head gasket help!

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    yamaha 3.0 l4 blew head gasket help!

    Never been in salt water but my previous boat mechanic ( retired this year ) said to replace the rubber impeller every couple years. I’d rather not take the lower unit off it’s so hard to find parts but I don’t want an issue with it when I’m done. I just need to find this little thermostat...
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    yamaha 3.0 l4 blew head gasket help!

    The only thing stamped on the thermostat is patent number. It’s a tiny little thing and googling it doesn’t seem to bring up anything even eBay. I wish I could send pics on this site . Wow they fixed it. 😁
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    yamaha 3.0 l4 blew head gasket help!

    Update. I had a blown head gasket & a bad spot inside the manifold at the center port. Someone previously had tried to weld the broken center port devider and that the area I had a previous exhaust leak also. I have replaced the head with a fully serviced ( all new seals , rockers etc. )...
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    yamaha 3.0 l4 blew head gasket help!

    I really appreciate all you guys support being an owner of not one but 2 30-50 year old boats is sometimes a challenge and frustrating. Especially the Yamaha , when I had a chance to purchase a low hours clean head , manifold and lower unit drive for 900.00 I couldn’t pass it up because of the...
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    yamaha 3.0 l4 blew head gasket help!

    I did buy a battery powered transfer pump from Harbor Freight but the hose size wouldn’t go down into the dipstick. Tried several ways to get it through there but ended up able to get the plug out of dipstick block. Only problem is it’s very hard to get back in doesn’t seem like it’s catching...
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    yamaha 3.0 l4 blew head gasket help!

    I’m going to replace the thermostat before I put it back together. Not sure which one to get since there’s virtually no way to source New parts
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    yamaha 3.0 l4 blew head gasket help!

    Got the plug out not much oil came out but it was milky. Going to pour quart of motor flush in it and see if that will get it cleaner. I will then change the oil and filter and try to run it and see how she does.
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    yamaha 3.0 l4 blew head gasket help!

    It is a brand new gauge and I did it twice , my boat mechanic ( now retired) said that 180 was great so idk. I adjusted the valves got quieter and ran good but now I need to get that milk cleaned out of oil and engine somehow before I change the oil. I can’t even figure out how to change...
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    yamaha 3.0 l4 blew head gasket help!

    I’m not sure. The temp gauge on the dash Never gets hot stays pretty steady. Good oil pressure too. Just want to get rid of that milky in the oil and somehow add something to clean up pan . Then put fresh oil , filter and put her back together. May switch out head , lifters. Pushrods over...
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    yamaha 3.0 l4 blew head gasket help!

    Ok I adjusted my valves which was a mess with the milk on them splattered everywhere 😩. The engine did smooth out and get quieter. Here’s the deal now I need to change my oil and I can not get to the dipstick block bolt and I can’t get my pneumatic brake bleeder to suck up the oil from the...
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    yamaha 3.0 l4 blew head gasket help!

    I bought a head that’s in great shape and a new manifold and xtra lower unit while they were available because they are virtually impossible to find. But a retired boat mechanic that used to work on the boat told me that the video I sent him noise that several people thinks is bottom end that...
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    yamaha 3.0 l4 blew head gasket help!

    Thanks for the advice. After some new information and a compression test I’m hoping I may not need to replace head gasket and it’d just a lifter or rocker arm issue
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