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Thread: 200 merc 2.4 jetting
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11-04-2019, 01:50 PM #165000 RPM
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Shes back together and idles nicely. I'd like to replace the water pump - is the key included with the impeller like they are on omc motors?
https://youtu.be/0xp3nB3Z5eU
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11-04-2019, 02:48 PM #17
So did u slap another slug in it and let her roll? Same motor with burnt piston?
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11-04-2019, 07:47 PM #185000 RPM
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Had 6 days off work, so in between morning and evening hunts and after dark I managed to get it Tore it down, new piston and rings (chrome bore) in the bad cylinder, new wrist pin bearings, rod cap bearings, and rod for the blown one, new rings for the other 5. Rebuilt carbs, new gasket set, every fuel line in the boat and engine were replaced.
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11-04-2019, 08:01 PM #19
Nice. Have u did compression test after runnin on idle for while? I'm just paranoid , and cameras and stuff do weird things and dont wanna scare u. Sounded like runnin on 5 towards the end of video prob just my ears. always good idea check fire and fuel/plugs after little runnin. Did u have to do any prep to that cyl?
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11-04-2019, 08:05 PM #20
I did say I was paranoid didnt I (after a build) I'd prolly jet that cyl up some till broke in good
May not make a diff tho little fat better little lean
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11-04-2019, 09:23 PM #215000 RPM
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I lightly honed all 6 cylinders since I replaced the rings. Soaked all the bearings in oil while I was reassembling. I pulled all 6 plug wires while idling and each one changed the running of the engine, so its running on all 6. Have to get the gauges in the boat hooked up, then I'll adjust my idle speed in the water. I know on omc the grey wire is the tach signal feed - what color is it in the merc harness?
Took compression after 20 minutes of initial run. Running double oil.
1 (previously blown) 121
2. 120
3 122
4 119
5 121
6 120
https://ibb.co/gzL6Y00Last edited by JoshKeller; 11-04-2019 at 09:26 PM.
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11-04-2019, 09:38 PM #22
10 4. Hope it works out for u. I know ain't but 1 kinda hone u suppose use on chrome. Not suppose hone at all. But sum people have tricks. Nice job and hope u get long life out of it
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11-05-2019, 12:21 PM #235000 RPM
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Any special break in procedure?
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11-05-2019, 01:31 PM #245000 RPM
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Also you mention jetting it up - what size would you go with? The .082?
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11-05-2019, 04:48 PM #25
Ya u need break in for rings. I'd run 32-1 for bout 15hrs variation rpm under 5k. and few heat cycles. let get up to temp and fully cool off. What carbs do u have again?39s? Do they come with 80 and 82s?
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11-06-2019, 06:59 AM #265000 RPM
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Whee 15 hours is going to be a year of running here. Yes the carbs are 39s and a mix of 80 and 82s on 2 and 5.
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11-06-2019, 07:27 AM #27
I'd go to 82 and 84 , least for little while , and run 32.1 for least 10hrs , then u can go 40.1. Ur beak in time shouldn't b as long as a full build. just tryin get rings and 1 piston to feel at home but is also good to let idle (high) 1k rpm or so n yard let get full temp and let cool off completely. Do that few times. When u do take it out. trim it down and run it like that. U want a load on the motor. Try not use trim while running
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11-06-2019, 08:13 AM #285000 RPM
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Best way to check check valves? Just see if they have movement?
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11-06-2019, 08:35 AM #29
Suck and blow thru hose. Should b 1 direction
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11-06-2019, 11:39 AM #301980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
1988 BAJA Sunsport 186, 96 225 Pro Max
79 12' Auminum, 95 Merc 9.9
RIP Stu
"So many idiots, so few bullets"
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