Motor rebuild done something wrong |
Post Reply | Page 12> |
Author | |
Blessed01
Member Joined: 13 Oct. 2013 Location: Gilbert, WV Status: Offline Points: 42 |
Post Options
Thanks(0)
Posted: 19 Feb. 2021 at 1:30am |
I sure would love for someone to help me out “PLEASE” I just rebuild my 134 flat head motor in my 46 CJ2A , everything seem to went good, the problem I have is while the engine is cranking pressure comes up though the carburetor, I have set the timing by the book, but still have the same thing, installed new bearings, pistons, valves everything what have I done wrong. It’s the first time I ever built a motor so have mercy on me please
|
|
smfulle
Member Sponsor Member Joined: 16 Sep. 2010 Location: Ogden, Utah Status: Offline Points: 6123 |
Post Options
Thanks(0)
|
Valves might be adjusted too tight so they don't close all the way on compression stroke.
|
|
Blessed01
Member Joined: 13 Oct. 2013 Location: Gilbert, WV Status: Offline Points: 42 |
Post Options
Thanks(0)
|
I will try to check that tomorrow, I think I did it right by the manual, and by asking and hearing others talk about how it’s done. But that to me makes a great deal of sense thank you very much
|
|
Chicodave
Member Joined: 13 May 2019 Location: Chico, Tx Status: Offline Points: 96 |
Post Options
Thanks(0)
|
You did line the dots on the crank and cam gear?
|
|
1949 CJ3a "Crap Game"
1951 Willys Truck 1950 Studebaker 2R5 1952 Chevy 3100 5 window |
|
Blessed01
Member Joined: 13 Oct. 2013 Location: Gilbert, WV Status: Offline Points: 42 |
Post Options
Thanks(1)
|
Yes I line them up, number one piston all the way up, valves closed did I do that right I sure hope so
|
|
Oldpappy
Member Joined: 09 Apr. 2018 Location: Tennessee Status: Offline Points: 4813 |
Post Options
Thanks(0)
|
"installed new bearings, pistons, valves everything"
What does "everything" mean? Describe what you did when you installed new valves. There are only a few possible causes for what you describe. 1) The valves are not seating, as Stan mentioned. This could be because they are too tight, too long, were not lapped properly, a broken spring, or a retainer has come loose. Most likely too tight. 2) Cam timing is off. Unlikely if you aligned the marks as you describe, provided you know which cylinder is number one. 3) Is it the original cam shaft, or did you install a new one? Chain drive or gear drive? First thing I would do is remove the valve cover and spark plugs, then turn the engine with a wrench while watching the valves, make sure both valves are closing when number one comes up to TDC on compression stroke. Check the lash which should be set between between .014 and .016. I usually set them .016 at first, then check and adjust after running for a while. Repeat the check and adjust on each cylinder in firing order. Edited by Oldpappy - 20 Feb. 2021 at 1:14pm |
|
If you can't get there in a Jeep you don't need to be there!
|
|
stevez
Member Joined: 07 Dec. 2020 Location: WNY Status: Offline Points: 73 |
Post Options
Thanks(0)
|
that was my first thought, is the right cam in there?
|
|
russnj
Admin Webmaster Joined: 20 July 2005 Location: W. Windsor, NJ Status: Offline Points: 3943 |
Post Options
Thanks(0)
|
Have a look at this rebuild website. See if you followed all the steps. http://jeepdraw.com/John_Barton_Engine_Rebuild1.html
|
|
43 MB, 48 CJ2A, 50 CJ3A, 55 M38A1, 56 CJ5, 79 M151A2, M100 ,65 M416 |
|
Lee MN
Member Joined: 13 Aug. 2008 Location: Harris, MN Status: Offline Points: 4923 |
Post Options
Thanks(0)
|
I’m pretty sure you cannot have the wrong camshaft!, a chain drive engine has a sprocket that bolts to the end of the cam (3 bolts), and the gear driven engine its pressed on with one center bolt, but I guess you could have an F head cam in an L engine ?, the lift on the intake valves would be drastically different!....
Lee |
|
LEE
44 GPW-The Perfected Willys 49 2A “If you wait, you only get older” 67 M715 American Made Rolling History |
|
cpt logger
Member Joined: 23 Sep. 2012 Location: Western Colorad Status: Online Points: 3022 |
Post Options
Thanks(0)
|
Are you trying to start the engine or is the ignition switch in the off position? In other words is there power to the coil? The reason I ask is if there is power to the coil, the ignition timing may be way off & the valve train might be OK. OTOH, If there is no power to the coil, then we need to thoroughly inspect the valve train. Let us know so we can help you with this problem, Cpt Logger.
|
|
Steelyard Blues
Member Joined: 09 Oct. 2017 Location: Reno, NV Status: Offline Points: 1482 |
Post Options
Thanks(0)
|
Did you correctly align the timing marks on the crank and flywheel when you reassembled?
Micah
|
|
1947 CJ2A 106327, Engine J109205, Tub 97077. Luzon Red
https://www.thecj2apage.com/forums/steelyard-blues_topic41024_post397981.html?KW=micah+movie#397981 1965 Johnson Furnace Company M416 #6-1577 |
|
Oldpappy
Member Joined: 09 Apr. 2018 Location: Tennessee Status: Offline Points: 4813 |
Post Options
Thanks(0)
|
The reason I asked what "everything" meant was I was wondering if he installed a new camshaft. I was wondering if it might be possible to install a F head cam into an L head engine. I have never tried that so don't know for sure, but as already said the intake valve timing would be way off. Might be worth the time just to see if it is possible to do that. I asked if it was a chain or gear drive cam for another reason. Someone had "rebuilt" it, so I put it in a Jeep to try it out.
It would not run, but it would throw a lot of flame out of the carburetor. Within a half hour of looking into it I found a puzzle. It was a a GPW engine with a gear drive cam. That was more than 30 years ago, so don't remember everything else that was wrong, but it had the wrong cam setup, and wrong oil pump gear. I completely tore it down and started over with it using the correct parts, it was the engine I used in an M38 I had back then. A lot of Jeeps are described as "Salad" because of the mixture of parts, which is okay with body and chassis parts, but engine salad doesn't work so well. I would advise folks to be very careful when buying parts off of Ebay or other internet auction sites. I have seen WW2 surplus cams listed with a description saying they would fit the civilian Jeeps, and seen generator fans listed as fitting a CJ. A generator fan will indeed fit, but it will push air the wrong direction, and as I described above a determined person can make the wrong cam fit too. Edited by Oldpappy - 21 Feb. 2021 at 1:54pm |
|
If you can't get there in a Jeep you don't need to be there!
|
|
MooCow
Member Joined: 20 Mar. 2016 Location: Belton, Mo Status: Offline Points: 101 |
Post Options
Thanks(0)
|
Isn't it possible to have the points on the 2 gears lined up and still be 180 degrees out with the #1 TDC? Arn you supposed to be on the compression stroke to truly be TDC? I got a little confused on this when I put mine together.
|
|
1949 CJ3A
|
|
Bruce W
Member Joined: 29 July 2005 Location: Northeast Colorado Status: Offline Points: 9611 |
Post Options
Thanks(0)
|
The #1 piston reaches TDC twice in each firing cycle. The camshaft determines whether it is on the compression stroke or the exhaust stroke. When the camshaft timing marks are aligned as they should be on assembly, #1 is at the top of the compression stroke, ready to start the power stroke. When the cam gear timing mark is on the other side of the gear (180* from the crankshaft gear mark), #1 and #4 are both at TDC with #4 in position to fire. Any time the marks are together it’s #1’s turn.
BW
|
|
It is NOT a Jeep Willys! It is a Willys jeep.
Happy Trails! Good-bye, Good Luck, and May the Good Lord Take a Likin' to You! We Have Miles to Jeep, Before We Sleep. |
|
MooCow
Member Joined: 20 Mar. 2016 Location: Belton, Mo Status: Offline Points: 101 |
Post Options
Thanks(0)
|
I guess I meant when you are assembling the engine you could mistakenly thank you have the correct timing but put the gear on wrong so they appear to line up but are really 180 out.
|
|
1949 CJ3A
|
|
WeeWilly
Member Sponsor Member x 2 Joined: 07 May 2009 Location: Clayton IN Status: Offline Points: 3422 |
Post Options
Thanks(0)
|
The gears are keyed, so impossible to install wrong. Jim
|
|
47 CJ2A (Ranch Hand) 48 CJ2A, 48 Willys truck, T3C 3782, M274 (Military Mule)
|
|
Oldpappy
Member Joined: 09 Apr. 2018 Location: Tennessee Status: Offline Points: 4813 |
Post Options
Thanks(0)
|
I hope he comes back and tells us what he has found to be the problem.
|
|
If you can't get there in a Jeep you don't need to be there!
|
|
cpt logger
Member Joined: 23 Sep. 2012 Location: Western Colorad Status: Online Points: 3022 |
Post Options
Thanks(0)
|
Me too. I really would like to know the solution to this mystery.
|
|
Post Reply | Page 12> |
Tweet |
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |