Do all old trucks leak or is there an acceptable amount?

[Keith Seymore]

My stuff leaks so bad - I opened the car trailer up where my chevelle was sitting and there was motor oil, trans fluid, rear gear lube and brake fluid all flowing down the floor.

Basically: if it had liquid in it - it was leaking.

My stuff leaks so bad - I drained all the oil out of my Farmall and it was still leaking.

K

[1970cstblazer]

I have replaced some gaskets on the Blazer, but the engine really has never been opened up beyond the valve covers. It sat for most of 25 years, so the rear main does seep a little, and I used Z Rod AMSOIL in everything old.

[IT Cowboy]

Now I am on a mission and it is a challenge to see if I can get it leak free. I look try to look at everything logically and if the surfaces are good, clean and the gaskets are quality and it is all put back and assembled correctly then it should not be leaking. At least the gaskets and even new pans aren't too expensive for me to try. I am wanting a trans pan with a drain plug in it now too.

When I was looking at trucks almost every ad said leak free but then I would see pics of carboard underneath and the seller would say oh, it does do a drop now and then, uh huh

I am hoping the new silicone type gaskets from fel-pro are nice and work well. I had a buddy who didn't believe in gaskets and just used RTV everywhere.

[D.B]

I don't know if this is true or not. But back in the day, early 80's. Ok don't laugh. I was going to wash my engine off at the local car wash and my dad said don't do it because it would cause it to leak. I told him it was already leaking and that's why it was so dirty. He said the old cork style gaskets were designed to seeped oil and attract dirt which helped seal up the engine. It sounded right at the time unless you have a massive leak.

[HO455]

Originally Posted by 67 twins

Wait! What? BBC use a rope seal? I thought they use a 2 piece rubber seal same as SBC. Tell me I'm wrong & I'll shut up. I've never had a big block.

Whoops my bad I forgot he had a BBC. Disregard my post. I've been wrapped up in fighting my own leaks.

[jumpsoffrock]

I'm here to piss all of you off lol: I inherited a 1967 C50 dump truck with a bill of sale from 1980 stating a mileage count of 217k miles at time of sale. The bottom of the engine is filthy like it has never been cleaned but none of the crud is wet with oil, it's all dry, the engine burns a quart of oil every 50 miles or so, sounds bad and really needs a rebuild.
This truck is used once every 2-3 months ans started once a month or so.
It sits static most of the time and is parked in the same spot when done being used.
The trans leaks.

Zero leaks from ANY point of the engine whatsoever.
How in Gods green earth does this happen lol

Old pic is from 1990 when it was given to dad as a "gift".
New pic is last year. Good truck.

[custom10nut]

While I was in the Army, we had a Category system to identify “Leaks”.
Cat 1: can be seen but only produces at the touch (slight weeping, very minor)
Cat 2: produces fluid but only dripping (not catastrophic with monitoring)
Cat 3: produces fluid in a steady stream (will lead to failure from loss of fluid).
Many of our trucks leak a little becuse the friction seals are over 50+ years old.
Most leak because the seal contracts faster that the shaft/bearing at shutdown
If you have OCD, you might not want and old vehicle.
My 70 has three minor leaks, that know need to be addressed, (oil pan, trans pan, and power steering box) but I just haven’t yet made the time to change out the faulty gaskets/seal. I do have the new parts on the shelf though

[57taskforce]

This thread made me laugh… mostly at the 350 in my K20 that pushes oil mist out the pcv breather because it’s wore out, it then blows all over the right side of the engine. It’s got the felpro silicone oil pan gasket and new timing cover and rear main gaskets, as well as the felpro silicone valve cover gaskets. It doesn’t really leak any where in any of those places. It also pushes oil out the front china wall but not because of bad gaskets… somedays it’s as good of an air compressor from the bottom end as it is an air pump for powering in the truck if you know what I mean lol. One of these days I’ll get the 6.0 built

It actually still runs pretty good all things considered, doesn’t foul plugs etc, but there is a really nice .030 or so lip at the top of the cylinders…

[PbFut]

This is a brand new Blue Print create engine. As you can see, both ends of the valve cover gasket creeped inward. This on the lower edge of cover and would have surely leaked. Hope the internals were better assembled.

[IT Cowboy]

Are the fel-pro blue silicone gaskets gtg?

[Cali72K20]

Originally Posted by IT Cowboy

Are the fel-pro blue silicone gaskets gtg?

Yes, they really do not require any RTV, I use this with the blue rubber gaskets.

https://www.gasgacinch.com/

For all other gaskets I use this.

https://www.permatex.com/products/ga...et-maker-3-oz/

My truck likes to leave its mark when parked, so I have one of these under it.

https://www.autozone.com/shop-and-ga...ray/475418_0_0

[57taskforce]

Originally Posted by IT Cowboy

Are the fel-pro blue silicone gaskets gtg?

They work pretty good. On the oil pan They recommend silicone across the timing cover and into the front corners. In the rear I believe it’s the same, across the rear lip of the pan and into the corners. I like to put a few very small dabs in the corners of the valve covers as well.

[Shark_13]

I've used a bunch of felpro gaskets on my Jeep. All good.

Another thing I like are the Lube Locker differential gaskets. They are reusable.

[HO455]

Some time ago I had a restricted PVC hose on the WMB. Once I replaced the collapsed hose my oil leakage was noticeably reduced.

[PbFut]

Originally Posted by IT Cowboy

Are the fel-pro blue silicone gaskets gtg?

Yes very good if installed correctly. Like a oil filter gasket, a film of oil is good to help squish and also assist release upon replacement. If using on a pan, timing cover or intake, be sure to dab a bit of RTV in the appropriate corners. No gasket will seal those areas. Last point is the front and rear arch of the oil pans. I found them not to be very snug on the 2 pans I attempted to use. I gave up on finding a good fitting reasonably priced pan. A liberal bead of RTV has held well. Last on your statement of using RTV like calk. I did so on a weep of oil in the arch area between pan and timing cover with success. Cleaned with brake cleaner, and run a bead. Smear and crossed my fingers.

[dmjlambert]

OK now I'm getting enthused about caulking my engine. 🥓

[57taskforce]

Originally Posted by PbFut

Yes very good if installed correctly. Like a oil filter gasket, a film of oil is good to help squish and also assist release upon replacement. If using on a pan, timing cover or intake, be sure to dab a bit of RTV in the appropriate corners. No gasket will seal those areas. Last point is the front and rear arch of the oil pans. I found them not to be very snug on the 2 pans I attempted to use. I gave up on finding a good fitting reasonably priced pan. A liberal bead of RTV has held well. Last on your statement of using RTV like calk. I did so on a weep of oil in the arch area between pan and timing cover with success. Cleaned with brake cleaner, and run a bead. Smear and crossed my fingers.

That’s what Felpro’s instructions say to do with the RTV.

[Shifty One]

Originally Posted by dmjlambert

OK now I'm getting enthused about caulking my engine. 🥓

JB Weld is better....

[IT Cowboy]

You folks can hate me now but the wife and I took the truck on a drive before I pit it away in the garage this evening around 4 pm. I just went to check on it and say goodnight and there are no drips on the floor. Maybe it is no big deal or doesn’t mean **** but that is nearly seven hours with no leaks showing or at least not showing on my garage floor! I told my wife that she helped me pick out a good one.

[dmjlambert]

Wake up and smell the gas fumes and motor oil! Now I'm doubly enthused about caulking my engine.

[raggedjim]

Sometimes it's not just the gaskets. I've had rear cam plugs leak, the intake manifold bolts can leak (easy fix usually), and if you have a plastic line running to your oil gauge it can leak like crazy!

I struggle with transmission leaks more than anything.

Good luck, Rg

[IT Cowboy]

Well, my truck sat in the garage for 17 hours on Sat. night before I checked on it again and there were no drips on the floor. I backed it out into the drive Sunday morning and it then put one small drop on the ground and I guess that was enough to squeeze the drop out of it lol. Again I don't think there is anything worth messing with now and with my luck I would not get something re-sealed and make it worse.

[raggedjim]

Originally Posted by IT Cowboy

Well, my truck sat in the garage for 17 hours on Sat. night before I checked on it again and there were no drips on the floor. I backed it out into the drive Sunday morning and it then put one small drop on the ground and I guess that was enough to squeeze the drop out of it lol. Again I don't think there is anything worth messing with now and with my luck I would not get something re-sealed and make it worse.

If that's all you have I wouldn't mess with it.