Author Topic: Engine question  (Read 3342 times)

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Offline easternMT

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Engine question
« on: June 28, 2010, 08:17:17 AM »
I have a 78 cvx with a 140 Johnson. I just picked it up. I have done anything with a boat in 10 years. I put it in battery not have a full charge. jumped it off my cousins boat. ran great then went out on lake just floated without it running for about hour. I go to start and it starts sputters a little and dies. I keep this process up for about 5 more times. battery doesn't have enough juice to turn it over. jump it sputters and dies. I go back and check the what i call the bulb that might be it name. No pressure on it i pump it I pump it 5 times still not a lot of pressure. I took it off the engine and pushed the end to release pressure and get it full pressure. I jumped it again. I took cables off gave it the gas took off. No problem got to dock. idle just fine when waited to go get trailer. I am going to check battery to see if it is good or should I just get a new one?
When it was sputtering it wasn't getting full gas to engine was my thought. Do I just need to make sure that bulb is pumped and has good pressure? or something else I need to do to it?
Should I run some seafoam through it since i just got the boat or some other type of cleaner through it?


Offline Hotwired

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Re: Engine question
« Reply #1 on: June 28, 2010, 10:39:49 AM »
I'll bet you have a clogged fuel pickup in your tank or at the very least a clogged filter. The gas tank my need to be cleaned out.  Try plumbing in a secondary tank, like a 5 gal gas can with a length of gas line attached and see if it will run from that.
.. it is what it is ... and that is how it should be!
Miss Mayberry - 1964 Saberflite
The Ship - 1979 CV-27
Canon Ball Eyes - 1976 CV-16ssV8
Da ProJect Bote - 1977 CV-23
It Is What It Is...... CVX20

Offline Tonka Jim

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Re: Engine question
« Reply #2 on: June 28, 2010, 12:03:40 PM »
It could be a bad check valve in the primer bulb.
Fuel is running back to tank  ???
1977 SSV-176 / '85 115 Merc. - Mine
1989  CV 23 / 350 - 270hp - Kelly's
1968 V-174 / '73 140 I/O - Gifted to Son
1971 Seaking 14' / 1958 Evenrude 7.5 - Gifted to Grandson

Offline V153

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Re: Engine question
« Reply #3 on: June 28, 2010, 05:13:57 PM »
It could be a bad check valve in the primer bulb.

Could very well be. Or as Chris said it could be a bunch of muck in the tank/filter(s) too. Inspect the fuel pump diaphragm also. In the past few months I've had to replace my fuel line/primer bulb & the male fittings on both tanks. The fuel line/primer was less than 3 years old. Gee thanks Ethanol!

re. Battery. Connections clean? Does it have any water in it? Will it take a full charge? Is the Alternator charging the battery?

Seafoam, etc wont hurt but I'd replace at least the fuel line & primer bulb before using it. It can sometimes aggravate the problem by loosening up chunks of crud from a deteriorating fuel line.

 

'81 C500_given away, bought back_75.1 mph
'81 Baja 15SS_140 Frankenrude_66.7 mph
'70 something SpeedCraft_(Allison 16R Clone)_69.0 mph
'79 CVZ19_given away
'71 V153_54.8 mph_wrecked


WALK TALL AND CARRY A BIG BILGE PUMP

Offline easternMT

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Re: Engine question
« Reply #4 on: June 29, 2010, 09:59:33 AM »
I charged up the battery and it doesn't take a full charge when I put it on the tester. So, I am going to pick up a new battery.
I am going to check out the fuel line. Probably tonight.

I am going to throw this out there. To charge the battery the engine needs to have a rectifier probably didn't spell it right but don't care. How do I check to make sure it is working. I believe it is on the right side of the engine if you where standing behind the engine and it is blue.

Offline V153

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Re: Engine question
« Reply #5 on: June 29, 2010, 04:54:52 PM »
Easiest way to check the charging system is to use a voltmeter & see what you're getting at the battery with the engine running. Does your boat not have an ammeter? Thought the CVXs did. Anyway the meter shouldn't read any less than 12V, duh. And if I remember correctly no more than 13.8V. Yes the voltage regulator, rectifier if you will, etc is on the stb side of the motor. Btw what year is your motor?

Don't "check" the fuel line. Replace it, along with the connectors. Cheap insurance. You can buy all the parts to do it from Attwood @ your local China(Wal)Mart for under $30 bucks.

Best of luck!







 
'81 C500_given away, bought back_75.1 mph
'81 Baja 15SS_140 Frankenrude_66.7 mph
'70 something SpeedCraft_(Allison 16R Clone)_69.0 mph
'79 CVZ19_given away
'71 V153_54.8 mph_wrecked


WALK TALL AND CARRY A BIG BILGE PUMP

Offline Rosscoe

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Re: Engine question
« Reply #6 on: June 29, 2010, 09:31:10 PM »
I am going to throw this out there. To charge the battery the engine needs to have a rectifier probably didn't spell it right but don't care. How do I check to make sure it is working. I believe it is on the right side of the engine if you where standing behind the engine and it is blue.

You did spell it right and we used to call em rectumfriers.  :D
Ross
61 Surflite 1964 90HP Johnson project
67 V163 Bayflite Super Sport  1989 100HP Merc
67 V164 Bayflite 120HP
67 V174 Crestflite Rat Rod
71 V175 Crestflite 350ci -Jet
73 GT 160
84 CVX 17  83 115 Merc
88 CVX-23 350 Mag

Offline easternMT

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Re: Engine question
« Reply #7 on: June 30, 2010, 10:33:49 AM »
The engine from my understanding didn't come with a rectifier but you could put one on. It does have one and when I checked it. It was working I hooked up the old battery without a full charge but got readings on ohm meter so I am going with a bad battery. The battery was not stored inside during two Montana winters so I am going to say that didn't help the battery out when you are hitting below zero for weeks at a time. New battery on the way.
I have to drive an hour to get parts or find someone who is going there to get parts. Walmart or any type of parts place is down the road. Makes things easy to do.