www.stationaryengineforum.net
Please log in , the forum is open to guests who are now able to view every section, feel free to become a member , you will then be able to post and reply to topics.

no compression

View previous topic View next topic Go down

no compression

Post by brooko on Fri Aug 17 2012, 19:42

hi i have no compression on my lister d i have had the engine apart as in restoring it i have had the piston out when i put it back in a oiled bore and i put some down bore when it was in and left it to soke down like people had been saying is it one of the valves sticking open or something else please help

brooko
Born to be wild
Born to be wild

Posts : 22
Join date : 2011-07-13
Age : 27
Location : cirencester, gloucetsershire

Back to top Go down

Re: no compression

Post by hob on Fri Aug 17 2012, 19:48

brooko wrote:hi i have no compression on my lister d i have had the engine apart as in restoring it i have had the piston out when i put it back in a oiled bore and i put some down bore when it was in and left it to soke down like people had been saying is it one of the valves sticking open or something else please help
were the rings loose in the piston grooves? did you check valve clearances? about 15 thousands of an inch i think. also check valves are not sticking in the guides. also valves might need cleaning and grinding in.

_________________
Lister D............ Lister domestic water pump
Petter A1 .......................Union pillar drill
National F type 1935.............wood planer
argosy pump
Villiers mk 15

hob
Life Member
Life Member

Posts : 727
Join date : 2011-06-14
Age : 64
Location : East Suffolk

Back to top Go down

Re: no compression

Post by brooko on Fri Aug 17 2012, 20:58

Ok the rings were lose when piston was out but when i put it back in all seemed good the valves could do with a clean ill try that

brooko
Born to be wild
Born to be wild

Posts : 22
Join date : 2011-07-13
Age : 27
Location : cirencester, gloucetsershire

Back to top Go down

Re: no compression

Post by stationary stu on Sat Aug 18 2012, 11:15

When you fitted the piston did you move the rings so as none of the gaps were inline?

Stu.

_________________
Engines are just like Pringles .... one is never enough.  Very Happy                                        I used to love tractors all I would ever think/talk about. Then one day out of the blue I went on to statinary engines, So you could say I'm an extractor fan.

stationary stu
Life Member
Life Member

Posts : 8962
Join date : 2009-07-21
Age : 58
Location : Stanley, Co. Durham.

Back to top Go down

Re: no compression

Post by pauldg on Sat Aug 18 2012, 11:54

Did you put the spark plug back in? Wink

When you say 'no' compression, is it like there is no plug there (spins freely) or is it just low (a bit of resistance every other turn of the crank)? If the valves are just a bit dirty but still move I'd expect a little bit...

Knowing whether there is none or little can help with diagnosis.

pauldg
A credit to the forum
A credit to the forum

Posts : 300
Join date : 2012-06-29
Age : 39
Location : South Wiltshire

Back to top Go down

Re: no compression

Post by brooko on Sat Aug 18 2012, 20:21

many thanks for the tips i removed the piston again and made sure rings were ok put it all back together and found i had compression but as soon as i refitted rocker shaft there was no compression again after further inspection i found there was no play on the exhaust rocker i set the rocker to the correct gap an dcompression returned so the problem was the exhaust valve was not shutting off. i cranked her over took a couple of cranks but it fired up sounds very knocky for my likeing is this due to were i have cleaned everything and the oil is not properly got all around the engine

brooko
Born to be wild
Born to be wild

Posts : 22
Join date : 2011-07-13
Age : 27
Location : cirencester, gloucetsershire

Back to top Go down

Re: no compression

Post by pauldg on Sat Aug 18 2012, 21:11

When you put it together, did you dip each part in oil?

If not, you should've...

pauldg
A credit to the forum
A credit to the forum

Posts : 300
Join date : 2012-06-29
Age : 39
Location : South Wiltshire

Back to top Go down

Re: no compression

Post by kevjhnsn on Sat Aug 18 2012, 21:35

was there much play in the pistons conecting rod bearings/shells,
also when you turned its crank to top and bottom dead center was there much movment slope in the piston up and down the bore
was the oil level to overflowing the filler
was/is the engine oil grey silver or with metal bits in it like filling
oil on your finger from sump is it thick and slippy or thin and soaks into your skin quick loss of slipping betwen fingers
kev

_________________
lol! " IF YOU DONT DO ANYTHING " "" YOU'LL NEVER MAKES MISTAKES "" lol!

kevjhnsn
Life Member
Life Member

Posts : 3598
Join date : 2011-02-10
Age : 38
Location : south cheshire

Back to top Go down

Re: no compression

Post by stationary stu on Sun Aug 19 2012, 10:36

Have another go at re-setting the tappets as there might have been a bit of dirt or something stuck in the valves. Have you greased/oiled all the points that need doing? There will be a few parts where the oil will take time to get to. Did you clean out all the oil ways with a bit of welding rod or similar?

Stu.

_________________
Engines are just like Pringles .... one is never enough.  Very Happy                                        I used to love tractors all I would ever think/talk about. Then one day out of the blue I went on to statinary engines, So you could say I'm an extractor fan.

stationary stu
Life Member
Life Member

Posts : 8962
Join date : 2009-07-21
Age : 58
Location : Stanley, Co. Durham.

Back to top Go down

Re: no compression

Post by Biggsy on Mon Aug 27 2012, 07:08

check for play on the big end bearing...bottom of piston conrod, mine was badly worn and had a lot of play, replaced it and the one i got from stationary engine parts was much better, i also totaly cleaned the rocker shaft and made sure grease holes were clear so when i re packet with grease i know its ok, also check timing, not sure about statics as its new to me too but on other engines i have worked on if ignition happens at tdc it can make some funny noises Shocked

Biggsy
Expert
Expert

Posts : 61
Join date : 2012-06-16
Age : 51
Location : NantyMoel near Bridgend

http://damned2hell.com

Back to top Go down

Re: no compression

Post by Sponsored content Today at 13:42


Sponsored content


Back to top Go down

View previous topic View next topic Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum