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kurfbird
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Joined: 02 Mar 2005
Posts: 866
Location: Whidbey Island
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 Posted: Wed Jun 02, 2010 10:05 pm Post subject: 3.1 engine problem possible intake leak water?? |
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Okay I brought a 91 firebird and had a bad bearing. Got a motor from a parts car 3.1 (Never Heard it Run) Checked the bearing etc.
Put on New heads
Seals
Gaskets
Freeze plugs
New parts
Started car Found out the new injectors from ebay are crap.
Found Water in the oil (Milk Shake)
Drain it and change oil and filter same thing happened.
Did loose some anti freeze from the raditor
Did a compression test and have above 150 PSI in all cylinders.
I am thinking its and intake gasket leaking since I have good compression.
No water shooting out of cylinders when cranking.
Anything else to check.
This is going to be my daughter car when she leaves for college
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kurfbird
1991 Camaro 3.1 v6
1991 Firebird 3.1 v6
1992 Formula 350 5.7
700r4 Transmissions
brucesthirdgenparts.com |
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aaron_sK
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Joined: 23 Jan 2006
Posts: 8834
Location: Back in beautiful Tacompton
1987 Chevrolet Camaro IROC-Z
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| Posted: Wed Jun 02, 2010 10:08 pm Post subject: |
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| Bad seal on the headgaskets when the heads went on, or the intake manifold as you suspected. |
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kurfbird
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Joined: 02 Mar 2005
Posts: 866
Location: Whidbey Island
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| Posted: Wed Jun 02, 2010 10:14 pm Post subject: How can I tell which. |
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| aaron_sK wrote: | | Bad seal on the headgaskets when the heads went on, or the intake manifold as you suspected. |
How can I tell which??
Guess it I pull the intake off and there is anti freeze there. Then probably intake. Dont want to do this twice. Well in my case three times.
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kurfbird
1991 Camaro 3.1 v6
1991 Firebird 3.1 v6
1992 Formula 350 5.7
700r4 Transmissions
brucesthirdgenparts.com |
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MrMike98
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Joined: 18 May 2010
Posts: 231
Location: Bremerton
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| Posted: Thu Jun 03, 2010 9:19 am Post subject: |
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an old trick was to run car at idle Carfully remove rad cap and if u see bubbling then its prob. head gasket.
odds are its a head gasket-did u have block decked and heads milled?
after 2 times it should be alot quicker to do this time:) |
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aaron_sK
Member
Joined: 23 Jan 2006
Posts: 8834
Location: Back in beautiful Tacompton
1987 Chevrolet Camaro IROC-Z
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| Posted: Thu Jun 03, 2010 9:35 am Post subject: |
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| MrMike98 wrote: | | an old trick was to run car at idle Carfully remove rad cap and if u see bubbling then its prob. head gasket. |
That only works if it's compression to coolant, which he already ruled out. Can still be oil to coolant without immediately involving the cylinder seal.
Bruce, I'd just buy another gasket set and reslap it. I recall gasket sets for the 60* engines being fairly cheap.
You could try and pull the intake off and take a look to see if there's an obvious failure point, but that's just more trips to the parts store if you're wrong. |
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MrMike98
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Joined: 18 May 2010
Posts: 231
Location: Bremerton
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| Posted: Thu Jun 03, 2010 10:12 am Post subject: |
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[quote="aaron_sK"] | MrMike98 wrote: | | an old trick was to run car at idle Carfully remove rad cap and if u see bubbling then its prob. head gasket. |
That only works if it's compression to coolant, which he already ruled out. Can still be oil to coolant without immediately involving the cylinder seal.
quote]
well i have seen it many times, guys do a compression check all sat, muddy oil etc.... when u run a comp check cold it may seal and give good comp readings, and when u heat up motor, then u have the head gasket issue show up as the gasket fails under stress
so donot deal in absolutes as that can lead u down the wrong path and makes troubleshooting much harder. all things are possible my friend.
with these motors it will be either the head or intake and I would put money on it being a head gasket or head bolts not installed using sealant. If not those then a mechanical issue with block (crack) |
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91RSVert
Member
Joined: 16 May 2007
Posts: 2736
Location: AR
1991 Chevrolet Camaro RS
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| Posted: Thu Jun 03, 2010 12:03 pm Post subject: |
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| On the 3.1, the timing cover also has coolant pass thru it. I have seen them cracked from heat, but not to the point of leaking coolant to oil... but it is possible. As well the gaskets could leak and do same thing. |
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Al Hasse
Member
Joined: 19 Nov 2005
Posts: 4379
Location: Bremerton, WA
1992 Chevrolet Camaro RS
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| Posted: Thu Jun 03, 2010 1:23 pm Post subject: |
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| 91RSVert wrote: | | On the 3.1, the timing cover also has coolant pass thru it. I have seen them cracked from heat, but not to the point of leaking coolant to oil... but it is possible. As well the gaskets could leak and do same thing. |
Yeah, I replaced my timing cover because of that a year or two ago. Fortunately, it leaked to the outside and on the ground.
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92 Camaro
89 Camaro
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aaron_sK
Member
Joined: 23 Jan 2006
Posts: 8834
Location: Back in beautiful Tacompton
1987 Chevrolet Camaro IROC-Z
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| Posted: Thu Jun 03, 2010 4:51 pm Post subject: |
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| 91RSVert wrote: | | On the 3.1, the timing cover also has coolant pass thru it. |
 Forgot about that one. You're totally right, that's also a very good possibility. |
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kurfbird
Member
Joined: 02 Mar 2005
Posts: 866
Location: Whidbey Island
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| Posted: Thu Jun 03, 2010 6:21 pm Post subject: 3.1 still trouble shooting |
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Okay
I applied pressure to cylinders with push rods out no collant ran out the radiator.
Twilightoptics sold me the heads. Saud they were decked etc. They ahve good compression.
Carefully drain colant and removed intake gasket. Feresh collant on the top not mixed.
Made sure passages were dry.
I think its the intake. I think I screwed up the torque on this intake.
Head bolts were repalced with selant on the threads.
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kurfbird
1991 Camaro 3.1 v6
1991 Firebird 3.1 v6
1992 Formula 350 5.7
700r4 Transmissions
brucesthirdgenparts.com |
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