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Subject: "bent valve question - really need advice" Previous topic | Next topic
CodedRedSep-07-04 04:51 AM
Member since Apr 07th 2004
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#80227, "bent valve question - really need advice"
Sep-07-04 04:52 AM by CodedRed

          

I'd really appreciate any advice anyone can give on this.
I recently did the headgasket on my '95 nt. Many lessons were learned, some the hard way.

But anyways...here's what happened.

When I first set the timing, there were painted marks on the gears that aligned with the dowels on the cams. So my dumb ass set these two marks facing each other. I knew the right marks to go by, and had intentions of doing it, but I guess I was just rushing and didn't do it. Lesson learned.

I tried to crank it over by hand, it was VERY hard to do - spark plugs were still in. Removed them, and turned the crank by hand 2 full revolutions. Turned pretty easy, no real sign that stands out in my mind of hitting valves.
Checked the timing marks, it looked to be perfect to me.

Got the car back together and cranked it over. Of course it didn't start, and I realized what I had done.
So I tore the belt back off and reset the timing the correct way this time.

Now, it runs, but it runs VEEEERY rough. Idle is horrible, blue smoke out the exhaust from burnt oil, and severely lacks power.

So the main question now is, if the timing is off a tooth - would it run that bad?
What are the odds I bent valves from the first (incorrect) timing setup? In all reality - if I did bend them, it shouldn't even run, correct?

What can I do next to check the situation?

Thanks for any help at all!

1996 Dodge Stratus - 2.4L 5-spd.
1995 Mitsu Eclipse - mildly modded

  

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Replies to this topic
RE: bent valve question - really need advice, KillemAll, Sep-07-04 05:58 AM, #1
RE: bent valve question - really need advice, Administratoradmin2, Sep-07-04 06:16 AM, #2
      RE: bent valve question - really need advice, CodedRed, Sep-07-04 06:47 AM, #3
           RE: bent valve question - really need advice, RickyMeeses, Sep-08-04 12:38 PM, #4
                RE: bent valve question - really need advice, Super20G, Sep-09-04 02:40 AM, #5
                     RE: bent valve question - really need advice, CodedRed, Sep-09-04 02:13 PM, #6
                          RE: bent valve question - really need advice, ConceptIllusions, Sep-09-04 07:38 PM, #7
                               RE: bent valve question - really need advice, AdministratorStar Turbo Talon, Sep-10-04 12:08 PM, #8
                                    RE: bent valve question - really need advice, CodedRed, Sep-10-04 03:33 PM, #9
                                         RE: bent valve question - really need advice, AdministratorStar Turbo Talon, Sep-11-04 04:21 AM, #10
                                              RE: bent valve question - really need advice, CodedRed, Sep-24-04 09:34 AM, #11
                                                   RE: bent valve question - really need advice, ughhhead, Sep-24-04 11:25 AM, #12
                                                        RE: bent valve question - really need advice, 2point4, Oct-15-04 04:58 PM, #13
                                                             RE: bent valve question - really need advice, CodedRed, Oct-21-04 02:52 PM, #14

KillemAllSep-07-04 05:58 AM
Member since Sep 03rd 2004
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#80228, "RE: bent valve question - really need advice"
In response to Reply # 0


          

even one tooth can cause a very screwed up idle. Redo your timing, and see how that works out. i highly doubt you bent a valve, did you hear any metal clanking?

  

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Administratoradmin2Sep-07-04 06:16 AM
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#80229, "RE: bent valve question - really need advice"
In response to Reply # 1


          

Do a compression test before you go tearing into things. Bent valves will give you very low compression in at least one cylinder.

_________________________________________
I'm the guy that bans you for breaking the rules. I am the troll killer. I am the law here.

  

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CodedRedSep-07-04 06:47 AM
Member since Apr 07th 2004
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#80233, "RE: bent valve question - really need advice"
In response to Reply # 2


          

I'll do a compression check tonight and see what the figures are then.
There's no sounds that would leave me to believe a valve broke, or anything rattling around in there.

Compression should be 180-ish, right?

1996 Dodge Stratus - 2.4L 5-spd.
1995 Mitsu Eclipse - mildly modded

  

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OldGuySep-08-04 12:38 PM
Member since May 04th 2003
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#80299, "RE: bent valve question - really need advice"
In response to Reply # 3


          

170-225 no more than a 25% difference between the cylinders.

So now at 44 what the hell do I do?

  

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Super20GSep-09-04 02:40 AM
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#80326, "RE: bent valve question - really need advice"
In response to Reply # 4


          

well, how were your results?

  

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CodedRedSep-09-04 02:13 PM
Member since Apr 07th 2004
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#80362, "RE: bent valve question - really need advice"
In response to Reply # 5
Sep-09-04 02:16 PM by CodedRed

          

I'll have it done this weekend at the latest and will post here with the results. I appreciate the follow-up and info guys.

Unfortunately, I got tied up at work most of this week and couldn't get it done, been crazy busy. emoji

1996 Dodge Stratus - 2.4L 5-spd.
1995 Mitsu Eclipse - mildly modded

  

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ConceptIllusionsSep-09-04 07:38 PM
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#80386, "RE: bent valve question - really need advice"
In response to Reply # 6


          

Blue smoke means oil burnin .. could be the rings or valve seals



www.cimotorsports.net

  

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AdministratorStar Turbo TalonSep-10-04 12:08 PM
Member since Oct 21st 2003
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#80411, "RE: bent valve question - really need advice"
In response to Reply # 7




          

If your compression is good, a few marks off will cause a real lopey idle. should not get blue smoke. Do a compression check, leak down test and post the results. You didnt get a lot of oil in the cylinders when you removed the head did you?

Terry

96 Eagle talon ESI
Greddy header - Greddy exhaust

97 Eclipse
Star Stage II - Boost/oil/EGT gauges - 3" custom DP/Apexi N1 3" exhaust - SFMU/return line - Apexi SAFC - Stage 2 6 puck Sprung hub MIBA clutch - Shortened shifter - Koni Yellows w/eibach prokit - Stillen Fr/Rr swaybars - ceramic intake - DEI Keyless entry alarm - Niche 17" Shoks

Waiting to be installed: HKS EVC IV, 450 Turbo injectors, GSX Front brakes (need rotors)

  

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CodedRedSep-10-04 03:33 PM
Member since Apr 07th 2004
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#80416, "RE: bent valve question - really need advice"
In response to Reply # 8


          

I'm doing the compression test tomorrow, I don't know anyone with a leakdown tester, so I may have to bring it to a local shop to have that done.
I didn't get a lot of oil in the cylinders with the head off, but there was a bit. Kept it pretty clean for the most part, and vacuumed it out with a shop vac before putting the head back on.

I'll post results. That's for the additional info!

1996 Dodge Stratus - 2.4L 5-spd.
1995 Mitsu Eclipse - mildly modded

  

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AdministratorStar Turbo TalonSep-11-04 04:21 AM
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#80435, "RE: bent valve question - really need advice"
In response to Reply # 9




          

Leakdown test is not a special tester. Depending on the type of compression tester you have.....use the adapter for the compression testor, remove the valve core in the tester adapter. The adapter has a fitting that a air hose will attach to with the gauge removed. use the aircompressor filled with air to fill the combustion chamber on the compression stroke.

Listen for air comming out the exhaust, intake, or oil dipstick/valve cover. In a perfect world you will have no leakage but a tiny bit is ok past the rings (remember they are dry and work with oil.) you can remove the airhose and adapter, squirt oil into the cylinder and retest. Leakage should almost be none. If a valve is bent you will hear either exhaust or intake. it will be obvious.

Terry

96 Eagle talon ESI
Greddy header - Greddy exhaust

97 Eclipse
Star Stage II - Boost/oil/EGT gauges - 3" custom DP/Apexi N1 3" exhaust - SFMU/return line - Apexi SAFC - Stage 2 6 puck Sprung hub MIBA clutch - Shortened shifter - Koni Yellows w/eibach prokit - Stillen Fr/Rr swaybars - ceramic intake - DEI Keyless entry alarm - Niche 17" Shoks

Waiting to be installed: HKS EVC IV, 450 Turbo injectors, GSX Front brakes (need rotors)

  

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CodedRedSep-24-04 09:34 AM
Member since Apr 07th 2004
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#80966, "RE: bent valve question - really need advice"
In response to Reply # 10


          

When doing the above with the air compressor, the piston you are checking should be at TDC only so the valves are closed, correct?

Compression results are that cylinder #2 has no compression at all. The other 3 are fine, I finally got the time to get this checked out.

I'm going to check that the lifters are ok, since they were all used lifters on the head I installed. At least I can do that with the head still on the car.

1996 Dodge Stratus - 2.4L 5-spd.
1995 Mitsu Eclipse - mildly modded

  

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ughhheadSep-24-04 11:25 AM
Member since Jul 05th 2003
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#80967, "RE: bent valve question - really need advice"
In response to Reply # 11


          

i believe that is correct.

  

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2point4Oct-15-04 04:58 PM
Member since Jun 16th 2004
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#81785, "RE: bent valve question - really need advice"
In response to Reply # 12


          

I think you should go ahead and yank the 2.4 from that stratus and go for the swap!! laterzzz...chris

  

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CodedRedOct-21-04 02:52 PM
Member since Apr 07th 2004
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#82064, "RE: bent valve question - really need advice"
In response to Reply # 13


          

I'm considering it, seeing as I'm building another 2.4 block for my stratus right now.

BTW - thanks to everyone for the help. Leakdown test showed exhaust valves were bent in the #2, and #3 cylinder. Head will be back on this weekend.

1996 Dodge Stratus - 2.4L 5-spd.
1995 Mitsu Eclipse - mildly modded

  

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