Hello! Log in or Register   |  Help  |  Donate  |  Buy Shirts  See all banner ads | Advertise on TheSamba.com  
TheSamba.com
 
36hp not firing ....help
Forum Index -> Vintage Speed Share: Facebook Twitter
Reply to topic
Print View
Quick sort: Show newest posts on top | Show oldest posts on top View previous topic :: View next topic  
Author Message
thesman
Samba Member


Joined: February 21, 2006
Posts: 5

thesman is offline 

PostPosted: Fri Mar 03, 2017 11:47 am    Post subject: 36hp not firing ....help Reply with quote

I am try to bench test a 36 hp engine and cannot get it to fire . It has a 28 pci carb . I have established spark to all plugs . I definitely have fuel going into the carb but the engine won't fire.
I have checked rechecked firing order 1 4 3 2 and have set pulley at tdc mark before firing and have timed it with a test light making sure rotor is at plug 1 . I did a compression check and the figures are ( cold engine )
cyl 1 80
cyl 2 100
cyl 3 100
cyl 4 100

I have try to set the valve clearance correctly but I have noticed that the rockers in cylinder 1 and 2 do not hold there the correct valve clearance but they get tight again after a few turns with a starter. Then at times the top of the rocker arms get to loose therefore increasing the valve clearance making the push rods feel loose on the lower arm of the rocker . Any Ideas / Advice appreciated . Thanks on advance . Tucker
Back to top
View user's profile Send private message Classifieds Feedback
Danwvw
Samba Member


Joined: July 31, 2012
Posts: 6036
Location: Oregon Coast
Danwvw is offline 

PostPosted: Fri Mar 03, 2017 11:57 am    Post subject: Re: 36hp not firing ....help Reply with quote

Sounds like it may have a rusted out cam lobe to me. Well if your adjusting the valves correctly? Has it been parked for a long time outside?
_________________
1971 VW Sundial Camper:
Build Sheet: Type 1 1679cc, Type1 1800cc's Webcam 118 and 1.25:1 Rockers, Type 1 1800cc with Webcam 163 my current daily driver.
Back to top
View user's profile Send private message Send e-mail Facebook Twitter Gallery Classifieds Feedback
thesman
Samba Member


Joined: February 21, 2006
Posts: 5

thesman is offline 

PostPosted: Fri Mar 03, 2017 12:01 pm    Post subject: Re: 36hp not firing ....help Reply with quote

the engine has been stored for a few years ....but moved / rotated freely
Back to top
View user's profile Send private message Classifieds Feedback
Danwvw
Samba Member


Joined: July 31, 2012
Posts: 6036
Location: Oregon Coast
Danwvw is offline 

PostPosted: Fri Mar 03, 2017 7:22 pm    Post subject: Re: 36hp not firing ....help Reply with quote

Well if the valve train is loosing adjustment then it should be pretty easy to figure out if it's something like the adjuster or something there. But, it could be the head is coming loose I suppose. Did you remove the rocker arm and try torquing the lower head bolts yet. But That doesn't add up if the compression test is recent?

It is hard to say what is going on with your engine here, It could start if you pushed the car maybe. But you know it's possible that there would be other things like the carb just need a good cleaning or the manifold gaskets have gotten bad and it has a vacuum leak. Double check Spark plug wires and their position and plugs that they are not old messed up plugs. I t may just need new plugs after setting all that time. Also you could have the timing somewhere wrong.

I am not sure on the loose 1,2 tight 1,2 valve adjusters, How loose do they get? Just .006" or a little more is ok, it is normal, right!

It could be it just needs to run and then it will settle down and be ok on valve adjustment.
_________________
1971 VW Sundial Camper:
Build Sheet: Type 1 1679cc, Type1 1800cc's Webcam 118 and 1.25:1 Rockers, Type 1 1800cc with Webcam 163 my current daily driver.
Back to top
View user's profile Send private message Send e-mail Facebook Twitter Gallery Classifieds Feedback
thesman
Samba Member


Joined: February 21, 2006
Posts: 5

thesman is offline 

PostPosted: Sat Mar 04, 2017 6:01 am    Post subject: Re: 36hp not firing ....help Reply with quote

Update.... I removed the rocker arms and inspected the push rod / lifters . Cylinder 1 push rods completely worn with deep groove of about 3 to 4 mm leaving a deep ridge on one side , Cylinders 2,3,4 also worn badly but no ridges but not as bad as cylinder 1 push rods.
This must explain why the valves lash would not hold after a few turns on the starter ? Also why compression is low on Cylinder 1 ? Also probably why the engine would not fire ?
Is it possible to put in a set of good used lifters ? or is a complete rebuild better as the cam must be badly worn. Thanks in advance .
Back to top
View user's profile Send private message Classifieds Feedback
Danwvw
Samba Member


Joined: July 31, 2012
Posts: 6036
Location: Oregon Coast
Danwvw is offline 

PostPosted: Sat Mar 04, 2017 12:38 pm    Post subject: Re: 36hp not firing ....help Reply with quote

Well, I am sure a lot of people have just replaced the lifter push-rods on them. How much lift are you getting on the cam for #1, The cam could be messed up also. If the cam lift is good just try another push-rod lifter. If it keeps changing valve adjustment over time then you will need a new cam for sure. WolfsBurgWest, AirCooledResearch, Cip1. It probably would be good to treat it with cam break-in compound and give it a good run when you get it started. Are you running a ZDDP oil additive or Lucus?
_________________
1971 VW Sundial Camper:
Build Sheet: Type 1 1679cc, Type1 1800cc's Webcam 118 and 1.25:1 Rockers, Type 1 1800cc with Webcam 163 my current daily driver.
Back to top
View user's profile Send private message Send e-mail Facebook Twitter Gallery Classifieds Feedback
Display posts from previous:   
Reply to topic    Forum Index -> Vintage Speed All times are Mountain Standard Time/Pacific Daylight Savings Time
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

About | Help! | Advertise | Donate | Premium Membership | Privacy/Terms of Use | Contact Us | Site Map
Copyright © 1996-2016, Everett Barnes. All Rights Reserved.
Not affiliated with or sponsored by Volkswagen of America | Forum powered by phpBB