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[TR] Blow-by on TR3-4 Engines (and maybe others)

To: "'Triumphs List'" <triumphs@autox.team.net>
Subject: [TR] Blow-by on TR3-4 Engines (and maybe others)
From: "John & Pat Donnelly" <pdonnel1@san.rr.com>
Date: Sat, 7 May 2011 20:25:00 -0700
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This a subject has been discussed recently, but I'm not sure I really heard
any useable answers. I have oil coming out of the dip stick and the rear
seal.  I sealed the dip stick with felt, but I think that made the real seal
leak worse.

 

Replacing  the PCV value didn't help. Opening the oil filler cap reveals a
lot of air coming out. I don't think that opening the crankcase breather
hole on a PVC controlled engine is the right thing to do since that would
screw around with the vacuum system.  I guess I'm looking for a
troubleshooting technique to do a diagnosis of the problem.

 

How much blow-by is too much? Can it be measured? Does anybody have a spec?

 

I'm about to run a leak down test to troubleshoot blow-by. How much a % loss
can I expect? How much of a variation between cylinders should be expected?

 

A compression test show the cylinders as 160-175-175-165, and the difference
between the inner and outer two cylinders concerns me.

 

Is there something else I should be looking for?

 

In August I plan to make the 1500 mile trek from San Diego to Breckenridge
and want a car that will make it there and back without leaving a big oil
trail.

 

Johnnie

'67 TR4A

 

 


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<p class=3DMsoNormal>This a subject has been discussed recently, but I'm =
not sure
I really heard any useable answers. I have oil coming out of the dip =
stick and
the rear seal.&nbsp; I sealed the dip stick with felt, but I think that =
made
the real seal leak worse.<o:p></o:p></p>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal>Replacing&nbsp; the PCV value didn&#8217;t help. =
Opening the
oil filler cap reveals a lot of air coming out. I don&#8217;t think that
opening the crankcase breather hole on a PVC controlled engine is the =
right
thing to do since that would screw around with the vacuum system. =
&nbsp;I guess
I'm looking for a troubleshooting technique to do a diagnosis of the =
problem.<o:p></o:p></p>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal>How much blow-by is too much? Can it be measured? =
Does
anybody have a spec?<o:p></o:p></p>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal>I'm about to run a leak down test to troubleshoot =
blow-by.
How much a % loss can I expect? How much of a variation between =
cylinders
should be expected?<o:p></o:p></p>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal>A compression test show the cylinders as =
160-175-175-165,
and the difference between the inner and outer two cylinders concerns =
me.<o:p></o:p></p>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal>Is there something else I should be looking =
for?<o:p></o:p></p>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal>In August I plan to make the 1500 mile trek from =
San Diego to
Breckenridge and want a car that will make it there and back without =
leaving a
big oil trail.<o:p></o:p></p>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal>Johnnie<o:p></o:p></p>

<p class=3DMsoNormal>'67 TR4A<o:p></o:p></p>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

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