Longblock assembly begins...

[krisnowicki]

I am going to be putting it all together this weekend. First question of many, can I run this engine with out the manifolds just for 20-30 mins outside the boat?

Below are pics of the engine old and new long block...
I am sure I will have more q's as I assemble

 

[krisnowicki]

Re: Longblock assembly begins...

the boat

 

[Bondo]

Re: Longblock assembly begins...

can I run this engine with out the manifolds just for 20-30 mins outside the boat?

Ayuh,... Sure, as long as it's fed fuel, electric, 'n water...

I like to test fire 'em on the floor myself...

 

[krisnowicki]

Re: Longblock assembly begins...

So running it with manifolds will not hurt? I have FWC so I am going to plum the exchanger to the garden hose.... I am just going to run it for a half hour or so to make sure we got no leaks and do base timing and carb set ups... I know the final ones have to be done in the boat underload.

 

[Kainon]

Re: Longblock assembly begins...

With manifolds and with water as mentioned.. no problem,

will be a little loud but hey, better to know it runs good before it goes in the boat.

can also take the oil pressure and temp gauge out of the boat and hook up.. only 3 wires each. at least the oil pressure.

or pick up a mechanical one and plumb with a T behind the DIST with the electric sender.

 

[Bondo]

Re: Longblock assembly begins...

So running it with manifolds will not hurt?

Ayuh,... So long as nothing Flamable is within a couple feet of each side,...

Nope, Go for it....

It's gonna be Extremely LOUD though....

 

[FreeBeeTony]

Re: Longblock assembly begins...

I think he was asking about running WITHOUT manifolds............

 

[Bondo]

Re: Longblock assembly begins...

I think he was asking about running WITHOUT manifolds............

Ayuh,... Hi Tony,... Believe it or not, I read it as you stated, not as I quoted,...:redface:

 

[FreeBeeTony]

Re: Longblock assembly begins...

Hey bondo.....I always understood it wasn't a good idea to run w/o manifolds.......no back presure??

 

[Alpheus]

Re: Longblock assembly begins...

I personally would not run it without manifolds. You are supposed to keep the RPM's constant at initial start-up to allow the cam to break in. This causes allot of heat and the lack of manifolds can allow cold air to rush into your open exhaust port and warp or crack your exhaust valves as soon as you shut off the engine. Its a very small chance that it will happen, but it can.

As for the no back pressure? Thats crap. 90% of the cars at the strip are running wide open exhaust that has zero back pressure. Only reason they have anything on there is to route the flames away from vital parts of the car...

 

[littlebookworm]

Re: Longblock assembly begins...

A few years ago I replaced the 5.0 Mercruiser engine on my 1986 Sunrunner Cruiser. Before the installation I ran the engine on my driveway, sitting in the wooden cradle I had made for it. I hooked up a garden hose for cooling, a battery for power and a 5 gallon can of gasoline with a flexible fuel line for energy. I made up a testing dashboard with a full set of guages and an ignition switch with key from a previous boat I had scrapped. I had the manifolds and the 4" rubber hoses attached. That thing was loud! But it ran beautifully. I set the timing and the carb on my driveway; much easier than leaning over a tight engine bay. Go for it, but wear ear protectors and aim the exhaust away from the garage. CO is deadly. Hy

 

[zbnutcase]

Re: Longblock assembly begins...

And why would you run it without manifolds? Old ones freeze cracked and don't have replacements yet? Just slap the old ones on and run 'em dry! Your hearing will thank you!

 

[krisnowicki]

Re: Longblock assembly begins...

I thought running them dry would damage them. I want to run it on the shop floor and not get water all over. So I got the engine 70% dressed. I am hoping to fire it up tongiht or tommorrow morning.

One problem, when I went to prime the oil it leaked in two places. The first was the oil pressure sensor hole that I forgot to plug. No problem there.

But the front crank seal leaked about a 4 oz of oil at first, then it stopped. But it hasnt leaked a drip since the first prime. I ran the drill for about 20-30 mins and there is a ton pressure and oil is right in the middle of the hash marks... Was it just the front seal, sealing? Or Do i need to disassemble?

 

[krisnowicki]

Re: Longblock assembly begins...

Pics of the dressed engine and what killed the old engine.... this rust was in the middle intake ports of the old engine..... Maybe rain water?

 

[Aloysius]

Re: Longblock assembly begins...

Why not get a couple of used car manifolds from a junk yard and put those on for the static run?

 

[zbnutcase]

Re: Longblock assembly begins...

I thought running them dry would damage them. I want to run it on the shop floor and not get water all over. So I got the engine 70% dressed. I am hoping to fire it up tongiht or tommorrow morning.

One problem, when I went to prime the oil it leaked in two places. The first was the oil pressure sensor hole that I forgot to plug. No problem there.

But the front crank seal leaked about a 4 oz of oil at first, then it stopped. But it hasnt leaked a drip since the first prime. I ran the drill for about 20-30 mins and there is a ton pressure and oil is right in the middle of the hash marks... Was it just the front seal, sealing? Or Do i need to disassemble?

Front crank seal should not leak AT ALL, It is not exposed to oil pressure at all, I think I would look closer...

 

[krisnowicki]

Re: Longblock assembly begins...

we poured 2 qts of oil in the valley under neath the intake I think it dripped down in the timing chain cover and leaks out there... I think I am good, I will see if leaks today with a good spin of the prime tool. I think i am good

 

[dan t.]

Re: Longblock assembly begins...

I hope you used the Fel-Pro aluminum based intake gaskets, those plastic based stock gaskets are junk and it is not a matter of if they will fail, it is just a matter of when

 

[John_S]

Re: Longblock assembly begins...

You are supposed to keep the RPM's constant at initial start-up to allow the cam to break in. ...

JPG 74 shows a roller cam, so he should not need the higher rpms like flat based lifter cams.