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Discussion Forum
Show Parts for Model:

Absolutely no compression

Author  [Modern View]
Toora Stephen

11-09-2008 14:57:19
203.2.133.74



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Hi all,

I replaced the head gasket on the weekend. After I put everything back together again, it wouldn't start (1951 TED20). It sounded like it was firing on one cylinder. In fact, it did start a couple of times but of course couldn't keep running on only 1.

I have a new compression tester, so I tried that. On cylinders 1, 2 and 4 there was absolutely no compression reading. Zero compression. On cylinder 3 I got about 90 which was what I was expecting.

How can there be no compression? The pistons looked OK to me. I didn't have a close look at the valves, but I didn't notice anything unusual. Could it be that the valves are not closing properly? Wouldn't you still get *some* compression??!

Any ideas? Where should I start?

- TS

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Toora Stephen

11-17-2008 13:58:25
203.2.133.74



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 Re: Absolutely no compression in reply to Toora Stephen, 11-09-2008 14:57:19  
Hi all,

I adjusted the valve rocker gaps and reassembled. The tractor started up right away and ran fine... at least until I got stuck. I'll post about that later.

Thanks for all your help.

- TS



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Toora Stephen

11-11-2008 20:01:33
203.2.133.74



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 Re: Absolutely no compression in reply to Toora Stephen, 11-09-2008 14:57:19  
Thanks, that's pretty-well what I expected. I also have the procedural advice provided by John (UK) and recently posted by motorv8n, so I should have no problems! I'll let you know how it goes.

- TS



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Toora Stephen

11-10-2008 13:39:11
203.2.133.74



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 Re: Absolutely no compression in reply to Toora Stephen, 11-09-2008 14:57:19  
Thanks again for all the replies. I have to say I missed the bit in the manual about adjusting valve clearance when I replaced the head gasket. The first time I replaced it it didn't seem to matter! I guess I was just lucky that time.

This weekend I will get back in there and adjust the valves. Do I need any special tools?

- TS



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Jerry/MT

11-11-2008 16:21:14
206.183.116.129



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 Re: Absolutely no compression in reply to Toora Stephen, 11-10-2008 13:39:11  
Just a feeler gauge and a small wrench and screwdriver.



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67

11-09-2008 20:50:24
161.184.180.183



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 Re: Absolutely no compression in reply to Toora Stephen, 11-09-2008 14:57:19  
I would also check valve lash after head has been removed. I believe inlet should be 0.010" and exhaust 0.012. You could check this at TDC no.1 cyl on compression stroke which would be bothpush rods retracted into block and no. 4 in rock position( one valve closing and the other about to open.) then follow firing order 1342 every 1/2 crankshaft turn in normal engine rotation.



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Brian Allen

11-09-2008 16:44:33
67.158.79.185



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 Re: Absolutely no compression in reply to Toora Stephen, 11-09-2008 14:57:19  
Toora Stephen

Properly setting the valve lash is critical.

Check clearances again after it is at operating temperature.

Brian



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Toora Stephen

11-09-2008 16:00:33
203.2.133.74



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 Re: Absolutely no compression in reply to Toora Stephen, 11-09-2008 14:57:19  
I'm pretty sure I aligned the rockers with the rods and tappets, and screwed them down.

I may need to set the valves - I just assumed they would be OK.

Thanks for the replies. Hopefully one of the above 2 issues is all it is... :-)

- TS



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John (UK)

11-10-2008 10:45:59
88.110.134.232



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 Re: Absolutely no compression in reply to Toora Stephen, 11-09-2008 16:00:33  
You cannot expect the valve clearance to be correct if you have removed the Head, you must reset the clearance, allow the engine to get to working temperature and then tighten the Head Down again and then reset the valve clearances again, you may have to reset the valves a couple of times to get them correct, especially if there is wear on the valves and rockers. If set correctly and no wear there should be no noise from the valve gear, they run very quiet, but often the ends of the valves wear and the face of the Rockers that rubs on the top of the valves wears a hole in the machined face of the Rockers.

John

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Gerald J.

11-09-2008 16:55:20
67.0.103.125



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 Re: Absolutely no compression in reply to Toora Stephen, 11-09-2008 16:00:33  
The valve clearance is very dependent on the head gasket thickness. You absolutely HAVE to set the valves after changing the head gasket, there is only one other option and that you already have, an engine that won't run.

Gerald J.



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Gerald J.

11-09-2008 15:55:12
4.254.65.74



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 Re: Absolutely no compression in reply to Toora Stephen, 11-09-2008 14:57:19  
Did you set the valves again after finishing torqueing the head bolts? If that new gasket was thinner than the old one, the valves would be held open.

Gerald J.



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Jerry/MT

11-09-2008 15:39:55
206.183.116.129



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 Re: Absolutely no compression in reply to Toora Stephen, 11-09-2008 14:57:19  
If you have zero compression on 1,2,& 4, then it's most likely a valve(s) is not closing on those cylinders. Are you sure you got the pushrods on the tappets and on the rockers when you put it together? Are the adjusting screws for the valves screwed all the way down so the valves aren't closing? Did you do anything to the camshaft/timing gear/timing chain when you took the head off?



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Tony in Mass

11-09-2008 15:22:10
65.54.97.186



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 Re: Absolutely no compression in reply to Toora Stephen, 11-09-2008 14:57:19  
Do you think the timing gear/ chain is broke? #3's valves are closed, everyone elses valves are open at least a little. good luck!



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