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H70 Engine Compression?


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#1 fishingbud OFFLINE  

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Posted August 10, 2013 - 11:07 PM

I get about 40 psi to 50 psi with a squirt of oil for compression. Anyone know if this is about normal? Thanks!

#2 chris m OFFLINE  

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Posted August 10, 2013 - 11:59 PM

I'm almost positive the H70 has a compression release on it? If so you wouldn't get a good reading when checking compression. Only way to do it would be if you could spin the engine backwards while checking it.



#3 JDBrian OFFLINE  

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Posted August 11, 2013 - 06:20 AM

How is it running. If it's only got 40 -50 pounds it wouldn't run very well.  When in doubt I usually pull the head and have a look at things. 



#4 superaben OFFLINE  

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Posted August 11, 2013 - 07:30 AM

50-60 pounds is low but still good for a small engine.  Tell us more about how it is running, or if you are just checking it over.  I've seen engines run like a champ with much less than that. 

 

I'm almost positive the H70 has a compression release on it? If so you wouldn't get a good reading when checking compression. Only way to do it would be if you could spin the engine backwards while checking it.

 

I didn't think the H70 had a compression release.  Maybe I'm wrong, though. 

 

Ben W.



#5 chris m OFFLINE  

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Posted August 11, 2013 - 11:30 AM

50-60 pounds is low but still good for a small engine.  Tell us more about how it is running, or if you are just checking it over.  I've seen engines run like a champ with much less than that. 

 

 

I didn't think the H70 had a compression release.  Maybe I'm wrong, though. 

 

Ben W.

I am not sure if they do? I have never had one to check.



#6 fishingbud OFFLINE  

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Posted August 11, 2013 - 02:27 PM

Oh it runs great, just checking it over while it's on my bench...

#7 drbish ONLINE  

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Posted August 11, 2013 - 03:46 PM

 The service manual that I have published by Interac covers all engines from Acme to Wisconsin Robin says that all models  Between H70 and TVM220, Do have compression release.

hh70.JPG

It also states that models between HH70 and HH120, Compression release is used on some models.It does not say which ones

 


Edited by new restorer, August 11, 2013 - 03:51 PM.

  • superaben said thank you

#8 fishingbud OFFLINE  

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Posted August 11, 2013 - 07:12 PM

Well i guess I'll just run it. Runs well and was just curious i guess




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