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07-29-2020, 08:15 PM #1
Would you run this cylinder head- in this condition-?
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07-29-2020, 08:21 PM #25000 RPM
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I would not, only in a pinch till I could get a replacement
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Aaronhl thanked for this post
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07-29-2020, 11:56 PM #3
Yeah, that kinda sucks, bud
1990 Shadow bass boat w/ 2.4 200 Merc. Totally resto'd boat and love it!
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07-30-2020, 04:36 AM #4
Soda blast, Mill, CC it and see if that will work for you. Mill and finish the other side to match. Can always hand sand or hand finish the shape too. I’m sure there are quench profiles here somewhere you can find to upgrade performance. Most of this work is all elbow grease and very little cost. Failing that there is always welding and reshaping. It doesn’t look that bad to me from the pics at least. Could be as simple as polishing the chambers and getting it milled. Lots of options
Hydrostream dreamin
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07-30-2020, 05:34 AM #5Junior Member
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The last pick doesn't look that bad too me, you could try sandblasting it a little too. Just not too much and not the mating surfaces.
As long as the mating surfaces are still level and not porous or cracked it will probably work. However if the mating surface is eaten away you need to get it milled and flattened.
When a gasket fails there's always the risk that something else is wrong though so check for anything weird and misaligned.
If you try it I'd give it a gentle break-in, varied low to medium rpm and low load for the first 3-4h.
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07-30-2020, 08:39 AM #6
I dont see any pitting in the gasket fire ring area, the pitting tn the squish area doesnt look any worse than the factory lost foam surface in the combustion chamber. I would bolt it on check compression... make sure that the plug/piston tops not miky or have dots of water after a test run ,run it on the lake check it again and enjoy.. tons of motors running around with dinged up heads from ring failures with no issues.
Last edited by H2OPERF; 07-30-2020 at 08:41 AM.
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Aaronhl thanked for this postDavid - WI, keefallan liked this post
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07-30-2020, 08:53 AM #7The Historic Photo Master
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...i would not use it...
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07-30-2020, 12:14 PM #8Screaming And Flying!
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dimpling, that cost extra
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keefallan liked this post
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07-30-2020, 12:35 PM #9
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07-30-2020, 02:37 PM #10
A quick soda blast and you would never be able to tell there was any shmoo on there. You can also use scent free oven cleaner but it does eat aluminum so you have to be careful. Practice on some other aluminum first. It does bring aluminum back out brilliant bright clean. Wash thoroughly with water and spray with WD40 after to protect
Hydrostream dreamin
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07-30-2020, 05:46 PM #11
Ok experts here another few for you
Seems like the stuck piston had been replaced before, it was the only piston with a center dot on the top of it, the other 5 did not have the dot, any ideas on why this one had the dot?
When putting a piston back in, if I do not see “UP” because of carbon build up, what is the positioning in relation to the rod n cylinder?
I think this piston wasn’t put in correctly because the rod part number wasn’t facing the flywheel. Is that required according to the manual?
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07-30-2020, 06:38 PM #12
Parts with those lost foam "big pores" welds marvelously …
I got tired of jigging and fixturing up every part that had rot , warpage , or a surface cleaned via chisel mechanic , just to take a skim cut. I got a 16" x 96" belt sander .. wax on ~ wax off , Mr. Miyagi .. done ..
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07-31-2020, 05:54 AM #13
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07-31-2020, 07:42 AM #14
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07-31-2020, 02:18 PM #15
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