SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: hawkins30 on May 01, 2014, 01:03:29 AM
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So I want to know if it is worth buying it's a 21 foot jet boat with a 455 the guy I might buy it from says that it's running kinda rough and that it's not putting out all the power that it needs he replaced spark plug and wires and he said that the freez plugs where leaking and that he fixed that problem but it was still running rough do u guy know what the problem could be
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Its a 455 >:D
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No sorry but it can be toooooo many things timing, fuel, flat cam, how well was motor balanced, dizzy, cap, rotor, or just motor is on its way out n maybe thats why he wants to dump it who knows. Take a compression test, bring a timing light check fuel filters check out the oil.
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He said it could be the cam or the lifters is that a easy fix or an exspensive fix
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So does it cost a lot to put a new cam and lifters in it
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Well if the boat is in good shape and u like it u can always swap it out for a 454 there are a few on Craig's and also I think one on this site for a decent price.
SRC
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So does it cost a lot to put a new cam and lifters in it
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If the guy selling this "thinks" it might need a new cam and lifters, just plan on rebuilding the whole motor. If the cam's gone, so's a hole lot of other parts, bet on it.
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He told me last night that it was running a little rough that it took it a little bit to get to 45 50 that it wasn't putting out its full potential
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My bet is it's on it way down. But if you like it and don't mind a project go for it. Post some pics of it
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So what does it mean when the oil is mixing with the water
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Pics of the 21 foot jet boat I might buy
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So what does it mean when the oil is mixing with the water
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Blown head gasket
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This will be my first jet boat I have ever owned I just wanna use it for wake boarding and tubing is it hard to fix the head gasket
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Oil in the water:
water getting through a gasket, could be head gasket, intake manifold gasket or the infamous timing chain cover. If the water issue is neglected your bearings will turn like the ones in the picture. And your rods might not stay straight... If there is water getting in the oil, and it's running rough, my opinion is rebuild needed for sure.
Where is the boat located?
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At this guys house in Washington I haven't bought it yet just wonder if it's worth buying
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I don't make much money and the boat is only 1600 so I figured something would be wrong with it but I don't wanna buy it if I half to replace the motor lol
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I don't make much money and the boat is only 1600 so I figured something would be wrong with it but I don't wanna buy it if I half to replace the motor lol
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I also replied to your other post. You can quickly check to see if the engine has a large capacity oil pan... If it doesn't, plan on an engine rebuild, AND additional parts that you will need to help support the oiling in the engine.
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At this guys house in Washington I haven't bought it yet just wonder if it's worth buying
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Where are you located? Seems like a far drive if you aren't in that area...
Just replacing a cam and lifters won't be cheap. The reason being if it has a flat cam, there are metal shavings everywhere in the motor, and it will ALL need to be gone through.
Figure you buy this boat, drop a grand (that's being VERY conservative) into it to make it run, you'd already have $2600 into it. Who knows what else it needs, but it'll need something. Might as well save a bit more, buy something that's turn key for around the 3K mark and go have fun.
Just some things to think about. :sly:
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Ok cool thanks ill do that
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That's what the guy said it might have a flat cam how do u know if the cam goes flat
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I also replied to your other post. You can quickly check to see if the engine has a large capacity oil pan... If it doesn't, plan on an engine rebuild, AND additional parts that you will need to help support the oiling in the engine.
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Why would the oil pan capacity instantly mean it'll need a engine rebuild?
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That's what the guy said it might have a flat cam how do u know if the cam goes flat
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Oil looks metallic
Rough idle
Poor performance under a load
Low compression
Failed leak down test
Easiest way is to pull valve covers, turn it over and look for a rocker arm that's not lifting as far as the others.
https://www.youtube.com/watch?v=iJjcbqbinA4 (https://www.youtube.com/watch?v=iJjcbqbinA4)
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Why would the oil pan capacity instantly mean it'll need a engine rebuild?
Hmmm... Flat cam, small oil pan!
Sounds like a healthy 455 engine to me!
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Where are you located? Seems like a far drive if you aren't in that area...
Just replacing a cam and lifters won't be cheap. The reason being if it has a flat cam, there are metal shavings everywhere in the motor, and it will ALL need to be gone through.
Figure you buy this boat, drop a grand (that's being VERY conservative) into it to make it run, you'd already have $2600 into it. Who knows what else it needs, but it'll need something. Might as well save a bit more, buy something that's turn key for around the 3K mark and go have fun.
Just some things to think about. :sly:
$1000 is very conservative lol, I agree with milekyle, move on to something else.
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Hmmm... Flat cam, small oil pan!
Sounds like a healthy 455 engine to me!
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Flat cam would contaminate the entire oiling system, no matter the capacity.
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Flat cam would contaminate the entire oiling system, no matter the capacity.
If an olds had been run with a small pan for any time in a jet boat, especially with no oil mods...it's injured
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If an olds had been run with a small pan for any time in a jet boat, especially with no oil mods...it's injured
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Hmmm, pretty broad statement.
Olds came in just about every jetboat in the 70's, ran for years, some still going to this day, trouble free. Stock oil pan and all. Including mine.
Guess it's about how it's driven, maintained and if rebuilt, how well it was done.
Cheers! :beer:
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Hmmm, pretty broad statement.
Olds came in just about every jetboat in the 70's, ran for years, some still going to this day, trouble free. Stock oil pan and all. Including mine.
Guess it's about how it's driven, maintained and if rebuilt, how well it was done.
Cheers! :beer:
Lucky dog! You're the original owner?
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Hmmm, pretty broad statement.
Olds came in just about every jetboat in the 70's, ran for years, some still going to this day, trouble free. Stock oil pan and all. Including mine.
Guess it's about how it's driven, maintained and if rebuilt, how well it was done.
Cheers! :beer:
Lucky dog! You're the original owner?
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Hmmm, pretty broad statement.
Olds came in just about every jetboat in the 70's, ran for years, some still going to this day, trouble free. Stock oil pan and all. Including mine.
Guess it's about how it's driven, maintained and if rebuilt, how well it was done.
Cheers! :beer:
Wonder how all those olds engines got the rep they have!
Your boat/engine is an exception, or an even bigger miracle!
You never mentioned how often you use your boat, and how many hours your engine has... Doesn't count if your on the trailer for 364 days a year and and the one day it's out, was from no wake zone to the closest beach!
Glad your Olds is doing well! I'm always happy when folks succeed with olds engines!
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Hmmm, pretty broad statement.
Olds came in just about every jetboat in the 70's, ran for years, some still going to this day, trouble free. Stock oil pan and all. Including mine.
Guess it's about how it's driven, maintained and if rebuilt, how well it was done.
Cheers! :beer:
Doesn't mean they never had problems and it also doesn't mean that the ones still going today haven't been rebuilt with bigger passages and a 12 qt pan. I had an olds with a stock pan and it burned bearings. Took it apart opened oil passages returning back to the cam put a 12qt pan and never had a problem
But if it has a flat cam already like he's saying it's most likely due to lack oil returning to the cam don't you think
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Hahaha, easy guys, easy!
Not the original owner, but guy I got it from was. Motor was rebuilt, but has been many many moons.
Boat's definitely not a trailer queen, by any means. Out almost every weekend, usually both days. Less then 20 minutes from home to being out on Elsinore. I don't drive like a grandma, but don't thrash it either.
I'm not saying a Olds engine doesn't have it's problems. By all means, I know they are prone to oiling problems, water pressure issues, water/oil contamination and don't like high RPMS. I know! I was just implying that just because it has a small oil pan, doesn't mean it automatically needs a rebuild.
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Hahaha, easy guys, easy!
Not the original owner, but guy I got it from was. Motor was rebuilt, but has been many many moons.
Boat's definitely not a trailer queen, by any means. Out almost every weekend, usually both days. Less then 20 minutes from home to being out on Elsinore. I don't drive like a grandma, but don't thrash it either.
I'm not saying a Olds engine doesn't have it's problems. By all means, I know they are prone to oiling problems, water pressure issues, water/oil contamination and don't like high RPMS. I know! I was just implying that just because it has a small oil pan, doesn't mean it automatically needs a rebuild.
That's never what I stated, or implied!
Oil pan suggestion was in addition to a number of other things known about the engine, wasn't it?
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Hahaha, easy guys, easy!
Not the original owner, but guy I got it from was. Motor was rebuilt, but has been many many moons.
Boat's definitely not a trailer queen, by any means. Out almost every weekend, usually both days. Less then 20 minutes from home to being out on Elsinore. I don't drive like a grandma, but don't thrash it either.
I'm not saying a Olds engine doesn't have it's problems. By all means, I know they are prone to oiling problems, water pressure issues, water/oil contamination and don't like high RPMS. I know! I was just implying that just because it has a small oil pan, doesn't mean it automatically needs a rebuild.
Lmao! "Many moons" I didn't think anyone else said that...
IMHO if the OP is looking to be ON the water soon and is on a budget, this isn't the best buy for him... I know there could be a perfectly good cheap fix for a rough running olds... Could simply be the timing, but I doubt it. Just my .02
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That's never what I stated, or implied!
Oil pan suggestion was in addition to a number of other things known about the engine, wasn't it?
I also replied to your other post. You can quickly check to see if the engine has a large capacity oil pan... If it doesn't, plan on an engine rebuild, AND additional parts that you will need to help support the oiling in the engine
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Maybe I interpreted it wrong, or don't understand what your trying to say here?
If so, my bad :thumbup: