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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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    yamaha 3.0 l4 blew head gasket help!

    I have some updated information. My retired boat mechanic that worked on this boat several times told me after I sent a video of it running that I may not have a blown head gasket. I made a video and because some mechanic friends think it might be bottom end noise I checked with a few more of...
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    yamaha 3.0 l4 blew head gasket help!

    Will parts for GM from Auto Zone work like they did in my 3.0 6 cyl 165 hp motor on my runabout. They looked up a 250 inline 6 truck motor for the lifters & the pushrods Thanks
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    yamaha 3.0 l4 blew head gasket help!

    now im really confused because another post where a guy wanted to swap yam parts for mercruiser they said he needed to swap all the wiring ,lower unit ,and much more . im just wanting to basically do a head gasket job or head swap to get my boat running again . i want to use my block and all...
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    yamaha 3.0 l4 blew head gasket help!

    Bondo sorry to go on lol but there is a local boat guy I've known for 40 years that has a few 3.0 inline 4 cyl motors i think 1 is a Volvo and one is a mercruiser , he has 5 or 6 manifolds but the ports are different than my head . your saying that doesn't matter so could i bolt one of the...
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    yamaha 3.0 l4 blew head gasket help!

    thanks for reply the ports on the head that mercruiser offers reman heads there are 8 ports and on my yam there are only 6 . i remember the manifold we bought 1/2 of the port would have been blocked if we bolted it to the head .wouldnt that cause flow issues , loss of power or cooling...
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