CAT 3126 stalled . won't restart

DIESEL engine, transmission and generator repair and maintenance discussion forum.
Post Reply
User avatar
rjr
First Mate
First Mate
Posts: 120
Joined: May 17th, 2018, 9:36 pm
Vessel Info: 440 MY
Location: Lake St. Clair
Has thanked: 25 times
Been thanked: 9 times

CAT 3126 stalled . won't restart

Post by rjr »

Recently we changed the fuel filters and afterwards started the engines and they ran fine.

Today the starboard engine coughed, choked and stalled. It won't restart. Have tried twice to restart - no luck.

Suggestions & advice welcome.
User avatar
waybomb
CYO Moderator
CYO Moderator
Posts: 2745
Joined: February 5th, 2013, 9:24 pm
Vessel Info: 1995 Boston Whaler Rage15
1987 3697 Carver Mariner
1988 Cougar 46 Kevlar Vee offshore
1969 15' Glasspar / 1967 Johnson Electromatic 85
Location: Saint Joseph,Mi
Has thanked: 69 times
Been thanked: 492 times

Re: CAT 3126 stalled . won't restart

Post by waybomb »

They ran fine for how long?
Did you fill the filters before you screwed them on?
Thanks
Fred
1969 Glaspar Avalon /1967 Johnson Electromatic 85
1987 Carver Mariner
1988 Cougar Kevlar 46' with triple blown 572 ci
1995 Boston Whaler Rage
Past - 1988 2807, 1989 4207 Aft
Viper
CYO Supporter
CYO Supporter
Posts: 6266
Joined: July 10th, 2015, 9:58 pm
Vessel Info: 1989 Carver 3807 Aft Cabin
Location: Ontario, Canada
Has thanked: 475 times
Been thanked: 1791 times

Re: CAT 3126 stalled . won't restart

Post by Viper »

Could be a few things but if the issue is related to the filter change, make sure the filter is on tight so she's not sucking air. Check the simple stuff first but ya, as Fred asked, how long did it run for after the filter change?
User avatar
tomschauer
Admiral
Admiral
Posts: 2323
Joined: March 28th, 2016, 10:52 pm
Vessel Info: 1998 Carver 355
Suspicious Fishes !
2022 Kawasaki 310X
Location: upper chesapeake bay
Has thanked: 326 times
Been thanked: 602 times

Re: CAT 3126 stalled . won't restart

Post by tomschauer »

I am not a diesel expert by any stretch, but if you changed the filters and didn't complete fill the canisters good chance you "ran out of fuel" .
Again, check what i say, but i think those cats had a mechanical injection pump and you need to crack a fuel line or two at the injectors while someone cranks it over until you get a solid stream of fuel. There may be a bleed port in the injector line that will allow you to bleed the air without cracking the lines at the injectors and making a mess, but I don't know what year and sub models they were on.
Maybe a youtube search?
User avatar
rjr
First Mate
First Mate
Posts: 120
Joined: May 17th, 2018, 9:36 pm
Vessel Info: 440 MY
Location: Lake St. Clair
Has thanked: 25 times
Been thanked: 9 times

Re: CAT 3126 stalled . won't restart

Post by rjr »

Turns out my "crack Mechanic" may have been on crack and did not (fully?) open the shut off valve on the tank. We tested engines for a couple of minutes after the filter change and they were fine. Headed out the other day and engine ran for about 5 minutes and then conked. Friend of mine found this video - https://www.youtube.com/watch?v=9fCPGWX ... ac%26Bravo - Of course, we tried priming it 4 or 5 times before he realized his error.

We did fill filters with fuel. Thanx to everyone.
Post Reply