SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: Brad @ SCJB on August 23, 2010, 06:32:25 PM
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I have a set of 990s w/ harman marine logs and looks like they dont line up what so ever. theres a good 1/8" gap....BUT its only on the drivers side. Passanger side is ok.
is this known with this combination or what?
should I change to a different set of logs? I would LOVE center rise setups, but thats a whole hell of a lotta coin i dont have.
this is a picture of the gasket on the log. the gasket fits the head correctly.
[attachimg=1]
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Has it always had an exhaust leak? Pretty weird........V-drive log maybe? Dun have any BBC logs here else I'd send one to try anyways......
Ray
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this the 3rd set of 990's these logs have been on.....#1 didnt leak....but #2 leaked...as well as this third set.
i thought they maybe got warped and needed to be milled, so i pulled them off and noticed this. my plug wire boots dont stand a chance against this leak. the gap is on all 4 cylinders, but only on the drivers side. ???
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You must have two passanger side heads ;D O0 J/K Looks like a bastard log to me
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try shit canning the gaskets.....little red on there.
maybe run a straight edge accross the mani.
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You must have two passanger side heads ;D O0 J/K Looks like a bastard log to me
LOL! I actually processed that same thought before I posted! :screwy: But where I was going was with a passenger side v-drive log, but probably still way off on that.
Check with Terry, I think his buddie Jay has, or had, a couple sets of center risers he was lookin to sell......
Ray
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I think Stevie Wonder drilled the holes and was being helped by Ray Charles.......Slot the holes....Or drill them bigger and use some hardened washers... :-\
I don't know...We had a set of Kodiaks on a cruiser. Save your pennies. :screwy:
http://www.kemequipment.com/engparts%28exhaust%29.html (http://www.kemequipment.com/engparts%28exhaust%29.html)
GT
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Check with Terry, I think his buddie Jay has, or had, a couple sets of center risers he was lookin to sell......
Ray
[/quote
Hey thats right I do......and I have a BBC cruiser now too
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try shit canning the gaskets.....little red on there.
maybe run a straight edge accross the mani.
they arent warped and its not an issue with gaskets. the ports arent lining up.
i think its time to invest in some through transom bassett headers. might be a cheaper route then center risers. I just dont know if they will fit under my engine cover.
if anyone see's a set out there for sale, let me know.
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they arent warped and its not an issue with gaskets. the ports arent lining up.
i think its time to invest in some through transom bassett headers. might be a cheaper route then center risers. I just dont know if they will fit under my engine cover.
if anyone see's a set out there for sale, let me know.
B-rad....Any chance you can get a picture of the gasket side of the manifold with a gasket sitting on it? Or is it put together?
This has me curious how that could get as goofey as it looks... :-\
I have a brand new set of 1997 Mercruiser 454 exhaust manifolds, but they are iron and weigh a whole bunch...(probably close to 50# each)...They have never had water through them. ;)
GT
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that is the manifold with the gasket laying on it as it would be. the bolt in the bottom right is there just to line up the holes.
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Hey weener, Jim Brock has a nice set of Dana center risers with the turn downs for like $600. TT Bassetts won't work for your boat, they're not meant to be run in an enclosed engine compartment, too much heat.
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Slot the holes
i think this is going to be my quick solution. i got a set of 990's on an upside down engine thats on a stand i can put studs in to test alignment.
for a home hack job, what do you suggest to slot the holes? I assume a drill bit of some sort. i guess i can snoop around home depot and see what they got.
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Get a deburring tool from homo depot, they look like a rotary file, but short and with a 1/4" shank so it'll fit in your drill. Follow that up with rat tail file and you'll be golden
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, what do you suggest to slot the holes? I assume a drill bit of some sort. i guess i can snoop around home depot and see what they got.
If you have a regular old plunge router and a square bit you're in business....otherwise just use a regular drill bit and some old fashioned elbow grease...
GT
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So i lined up the gasket on the manifold for where it should be....then marked the holes with a sharpie.
[attachimg=1]
[attachimg=2]
i elongated them with a file drill at first which was taking forever, so then i went to town on them with a plain ol' drill bit which worked better/faster
the final product...
[attachimg=3]
tomorrow im going to do some port matching, these are horrid. :o
[attachimg=4]
elongated holes...
[attachimg=5]
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So i lined up the gasket on the manifold for where it should be....then marked the holes with a sharpie.
i elongated them with a file drill at first which was taking forever, so then i went to town on them with a plain ol' drill bit which worked better/faster
tomorrow im going to do some port matching, these are horrid. :o
:thumbup: :thumbup: Way more gooderer ;)
GT
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F**K those were Waaay off alignment :o
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F**K those were Waaay off alignment :o
I think those are Magoo Racing Products manifolds..... :sly:
[attachimg=#]
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so i woke up last night thinking about these damn things....
the plan was to start hacking away those chunks of metal blocking the ports......but i had this vision of them being thin areas and cutting into the water jacketing.....rendering these logs useless.
so, im gunna leave them alone. better safe than sorry. i got a line on some center risers that might fit under my engine cover, but for now, these will do.
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I think the casting guy fell asleep when he made that side. You may have issues with the ports not lining up. I know 990's weak spot is in the exhaust ports. f it as long as your not running gobs of nitrous.
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I think the casting guy fell asleep when he made that side. You may have issues with the ports not lining up. I know 990's weak spot is in the exhaust ports. f it as long as your not running gobs of nitrous.
i have to agree....if i wasnt in a crunch for time, i'd pull the other side off to compare
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well, so far this was a success. no leaks.
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:thumbup: