Not so good find on my 502 MPI
03-13-2019, 05:37 PM
#1
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Not so good find on my 502 MPI
We pulled the port engine out of the boat the other night so we could r-n-r the transmission. The job wasn’t too bad, but I recommend doing when you do not have the flu! As the hoist was dragging it up, I saw something not so good on the even side of the block. It looks like the head was leaking from the mating surface, or that it may have even cracked above the mating surface (head). There’s lots of rust to the point where good-sized flakes came off of the block, about the thickness of a quarter,
I’m going to snatch the top-end off and hope the block is okay. I have a line on a set of fresh 088 heads. I’m hoping the deck is good.
Anyone seen it this bad? Nothing froze on this motor, and it was running well until it ran wasted the trans seal (I did have some popping through the intake late season, but I think it was electrical).
I’m going to snatch the top-end off and hope the block is okay. I have a line on a set of fresh 088 heads. I’m hoping the deck is good.
Anyone seen it this bad? Nothing froze on this motor, and it was running well until it ran wasted the trans seal (I did have some popping through the intake late season, but I think it was electrical).
Last edited by TomZ; 03-13-2019 at 05:45 PM.
03-13-2019, 06:47 PM
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I have seen plenty of them corroded there but it is usually from water leaking and sitting there, not from a crack. See what the head gasket looks like when you pull the head.
03-13-2019, 08:46 PM
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There would be no way for water to sit there. The motor has CMI’s on it, and nothing is leaking that I can tell. It’s possible that the old exhaust leaked prior to them being put in this boat. Just speculation.
It would seem to me that maybe the head gasket was leaking/seeping, and the end result is what we’re seeing. It looks like water was coming from there and dripping down the knock sensor and dipstick tune.
Hoping the deck surface is serviceable.
It would seem to me that maybe the head gasket was leaking/seeping, and the end result is what we’re seeing. It looks like water was coming from there and dripping down the knock sensor and dipstick tune.
Hoping the deck surface is serviceable.
03-13-2019, 10:16 PM
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I don’t think the pictures really show the detail versus seeing it with the naked eye. At first glance it looked like freeze damage to me, but after removing some of the rust, it was all solid. I think what you’re seeing is the paint bubbles up with rust underneath.
I’ve never seen any leaks, and the motor builds 25 psi of pressure at cruise, 35 psi at wot. I’d think there would be evidence of a leak.
Good eye though BUP. Hoping it’s not freeze damage! If so, I guess I’m breaking out the check book.
I’ve never seen any leaks, and the motor builds 25 psi of pressure at cruise, 35 psi at wot. I’d think there would be evidence of a leak.
Good eye though BUP. Hoping it’s not freeze damage! If so, I guess I’m breaking out the check book.
03-13-2019, 10:19 PM
#7
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Just reread BUP. There’s no crack there. I stopped pulling pieces away at that spot. The whole area was bubbled up. The match to that area came off as a solid rust flake/chunk. Solid in that crevice.
03-13-2019, 10:43 PM
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some serious corrosion. I only see that (real bad block corrosion) on plow trucks around here. By your location you are in salt huh ?
03-14-2019, 06:46 AM
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I’m in Virginia Beach and run in brackish for the most part, though last year I ran in more ocean water because of where I was keeping her. The boat came from the Chesapeake Bay just south of Annapolis so brackish up that way.
I’ve only had the boat a couple of years; this looks like it’s been happening for a while. I frequently washdown the motor, and I spray it with anticorrosives.
I’ve only had the boat a couple of years; this looks like it’s been happening for a while. I frequently washdown the motor, and I spray it with anticorrosives.
