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| What is this? (Pics inside) 3.4L engine with coolant leak (Page 1/1) |
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Rsvl-Rider
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MAY 08, 03:26 PM
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I'm chasing down a coolant leak on a 3.4L. I thought it was coming from behind the timing cover but then I noticed this odd silver quarter sized disc that seems to be held down on the edge by a 10 mm bolt. I'm not familiar with this thing but bells went off when I saw it move slightly. Whatever it is, it's not completely tight.
What is it, and could it be the source of my coolant leak?
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olejoedad
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MAY 08, 04:54 PM
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That is the port for the cam sensor on the 3.4 block.
It should not leak coolant, oil yes, but not coolant.
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Rsvl-Rider
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MAY 08, 05:29 PM
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| quote | Originally posted by olejoedad:
That is the port for the cam sensor on the 3.4 block.
It should not leak coolant, oil yes, but not coolant. |
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OK, thank you for that. It's apparently not the source of my coolant leak, but it does raise some questions for me.
There is no sensor at the port. Is this not used on the Fiero?
Is the silver disk shown in my pictures typical in the 3.4 swap?
Since this one is a bit loose how would I seal it properly?
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Raydar
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MAY 08, 06:09 PM
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| quote | Originally posted by Rsvl-Rider:
There is no sensor at the port. Is this not used on the Fiero?
Is the silver disk shown in my pictures typical in the 3.4 swap?
Since this one is a bit loose how would I seal it properly?
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It's not used on the 3.4, as installed in the Fiero. But all 3.4s will have either a "dead" sensor, or that plug.
If you remove the 10mm, you might be able to get the plug out.
The only oil likely to escape will be any that gets slung off the timing gear or chain. I would be more concerned about water getting in, if you pressure wash your engine, or whatever.
If you can't get the plug out, just wipe some silicone around the edges of it, where it sits.
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olejoedad
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MAY 08, 07:02 PM
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/\/\/\ what raydar said /\/\/\
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Dennis LaGrua
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MAY 09, 06:00 AM
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I believe that most 3.4L swaps just keep the old sensor in place as it has an O ring on the sensor that seals it. Certainly not the source of a coolant leak. The front timing cover might leak as the water pump goes feeds through that area. ------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "
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fierofool
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MAY 09, 11:09 AM
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My 3.4 didn't have a sensor as it came out of the Camaro, though parts lists show one is available. I even purchased a cam sensor in preparation for my 7730 ECM conversion, I ran mine on a distributor for years and recently went to DIS like the original 3.4, but the cam sensor isn't used in the 7730 conversions, either.
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theogre
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MAY 09, 11:26 AM
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Coolant maybe just pooling there from leak above like T-stat house where bolted to intake.
T-stat looks like installed w/ RTV... Worse, Gasket w/ RTV.
RTV has rules or will fail to seal sooner or little later. Top 2...
1. Clean to metal or whatever coating on parts w/ brake clean.
2. Do Not use it w/ any gasket unless a gasket set say use it in specific areas. Example: Oil Pan sides meet "rubber" front and/or back on some engines.------------------
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)
The Ogre's Fiero Cave
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