OMC 460 cooling system issue?

[lekmedm]

Re: OMC 460 cooling system issue?

I have the same set up as you (OMC 460) and have an open thread dealing with the same problem. My risers were pretty clogged up too with rust. Using a couple of small screwdrivers I was able to open them up pretty well. I know this isn't a long term solution, but it's better than nothing.

To clean out the riser, I would scrape the insides of the risers with a screwdriver. I'd also twist the screwdriver back and forth to break the rust pieces up so they were small enough to come out. Then I'd lift it up and shake out all the flakes of rust. I also had to do this around the water outlet side. Make sure the little v cut outs on the flange are open too. I spend about 90 minutes on each riser and they look pretty decent now.

There's still the risk that the risers have an internal leak, but they looked ok upon inspection.

I'd done this same "cleaning" on the manifolds and risers a couple of years ago and they've worked well until recently.

Good to see another 460 on the board! We can share our misery! Actually, the Ford 460 is a great engine, the only misery is when it comes to marine parts for it.

As to your cleaning method, I've read on other boating forums of guys soaking their manifolds and risers in muriatic acid for 90 minutes and having a handfull or 2 of rusty garbage just flow out.

 

[lekmedm]

Re: OMC 460 cooling system issue?

Im installing new manifolds on my 460 from hitek marine these are stainlles steel.they have outsourced manufactureing so prices are more resa nible .MARINE PARTS SOURCE has originals in stock.N ew couplers are available . I LOVE MY 460.

Greetings!

Pricing and a link would be nice.

 

[lekmedm]

OMC 460 manifold/riser options

OMC 460 manifold/riser options

Yes those were the adapters that the guy was talking about. (Maybe he'll see this and comment...)

I'm not saying that you can't use those adapters. They might solve the riser problem since you'd be using risers that would bolt to the BBC manifolds that you'll be using with the adapters.

You will have to sort of re-plumb to match up with your Y-pipe or thru hulls though...

That shouldn't be all that hard if you have some rubber pipe/fittings etc to work with...You may have to do a little fab work....

None of this is impossible. ......

Good luck,


Rick

Thank you, Rick. Do you have any opinion on a set of 454 manifolds and risers to use? I have seen that several different manufacturers make these parts.

 

[lekmedm]

different manifold kits?

different manifold kits?

What's the difference between this Barr Style Manifold Kit and this other 454 Manifold Kit?

If I go with the adapter plate, which type of manifolds should I buy?

 

[HT32BSX115]

Re: OMC 460 cooling system issue?

Do you have any opinion on a set of 454 manifolds and risers to use? I have seen that several different manufacturers make these parts.

No, I don't other than so say others have had big problems with GLM manifolds in the past (do a search here)

I found a set of Brand new GLM 454 manifolds and gaskets in Puyallup, wa on Craigslist for $200.

Pretty good deal but if they're of poor quality it's not worth getting them.



For any of you thinking about "cleaning" out your manifolds and/or risers, you run a fairly big risk of getting to the point of them leaking.


Cast iron manifolds are designed thick enough to "shed" metal in the form of rust internally where raw water contacts. They are of finite thickness and there's no way to determine when they'll start to leak thru. When this happens you'll fill your exhaust ports with salt water. If you have any open exhaust valves open at the time (and you shut it down even for just a few days it will destroy the engine fairly quickly!


You're right. The 460 was a good engine.....It's just that no one other than OMC used it and then it was for only 4 years or so.....That sure makes it hard on the people that still have them!

 

[Don S]

Re: OMC 460 cooling system issue?

Before you spend a lot for manifolds, risers, and adapters, just remember one thing.
You can not get couplers for the 460 engine, they don't exist. Between the coupler, the manifolds and risers, and outdrive gear sets for the 460 being NLA, how much more money are you going to have to throw into that hole in the water.

 

[lekmedm]

Re: OMC 460 cooling system issue?

Thanks for all the replies everyone.

Does anyone know if the original OMC exhaust is a 3 inch or 4 inch setup?

 

[HT32BSX115]

Re: OMC 460 cooling system issue?

If you're talking about the risers, they used 4" exhaust hose.

I Still have the Capts Call system that came off mine and it was also 4" SS tubing to the thru hulls.

The y-pipes were slightly less diameter. Maybe 3.5"

 

[stevetriton]

Re: OMC 460 cooling system issue?

Chrysler marinized the 460 for 2 or 3 years in the late 80,s.Part of the terms of the bailout was they had to stop building the gas hog 440. but chrysler had contracts with rv and boat makers so thats why theres a CHRYSLER M460.The hitek manifolds cost 2000$ but im good to go fore a long time.

 

[HT32BSX115]

Re: OMC 460 cooling system issue?

Chrysler marinized the 460 for 2 or 3 years in the late 80,s.Part of the terms of the bailout was they had to stop building the gas hog 440. but chrysler had contracts with rv and boat makers so thats why theres a CHRYSLER M460.The hitek manifolds cost 2000$ but im good to go fore a long time.

You have a stern drive on your "Chrysler" 460?

 

[stevetriton]

Re: OMC 460 cooling system issue?

Velvet drive 72c basicly bullet proof and cheap to rebuild or by new.Doug russel marine has the dreaded couplers a couple at a time to keep the price up. What was the real cost of your swap in time and materials? I love my 460

 

[HT32BSX115]

Re: OMC 460 cooling system issue?

You don't use an OMC Cobra coupler with a V-drive anyway do you?

 

[whiterhino73]

Re: OMC 460 cooling system issue?

Hello,
I'm looking for a boat for the family...I was considering a boat that has a Cobra 460 in it. The boat is in very good shape to be a 1985.. The owner keeps it in the water behind his home..
The engine was working last summer, but He can't get it started now... I have only rebuilt 3 auto engines but never a marine eng... After reading these messages gets me thinking about the cobra 460 eng... Is it really that hard to get part? What would a rebuilt or replacement eng cost? Thanks to all that make time to answer the questions that we have..

 

[HT32BSX115]

Re: OMC 460 cooling system issue?

Howdy,


#1. DON'T BUY ANY BOAT WITH AN OMC 460 ENGINE!

#2. When you have a question, it's usually best to start a new thread instead of tagging on to any thread old or otherwise.

#3. DON'T BUY ANY BOAT WITH AN OMC 460 ENGINE!