Marinette Boat Forum

I can see that the problem was you did not have a mechanic, you had an idiot that said he was a mechanic. Very common problem for many car/boat/equipment owners. :| The bad thing is, these guys put a bad taste in a potential customers mouth even towards the techs who are good, and know what they ar...

$100 plus shipping per manifold.

If a hole showed up once, they are only going to keep showing up. Replace it. You can still buy them new. Take a close look at your end plate and riser/outlet. If the gasket surfaces are getting rusty, replace them, or if it is in good enough shape, and you have someone who can do it, machine them f...

Velvet drives are one of the most reliable, robust and simple transmissions ever built. JI Case used a modified version with an automotive style torque convertor in their backhoe loaders for years. Paragon is good, but parts are getting harder to get, and I personally think they are not as robust. Z...

Most of the o2 sensors are in the risers. Most of the efi boats I have run do worse on fuel consumption than a good Q jet or afb, until they hit about 2/3 throttle.

The only 2843675 head I have is in my scrap pile. Don't know why, but it has been blasted so I assume it is cracked. Your head is a large chamber head. The only good heads I have are small chamber. However, I compared your head to some others in my scrap pile. 4027593 (77-84 318) has the same chambe...

Might the number be 2843675? That is the generic 68-74 318 head. I will check my stock tonight. How many do you need?

Fastjeff wrote:..."Marine engines are open loop (don't use O2 sensors"

Then how do they work properly? I seem to recall seeing an O2 sensor on a Mercruiser EFI engine.

Jeff

They don't run properly. They all run rich to be on the safe side. The first 3 or 4 generations of efi don't use O2 sensors.

Somebody out there makes a spacer plate for the Mercruiser risers so an o2 sensor can be used. I can't remember who makes it though. If you want TBI, you could try Affordable Fuel Injection outside of Lansing, MI. They build custom systems for different applications. I would recommend staying away f...

Is the engine you have the same as the Ford Lehman common to Grand Banks trawlers. If so, last time I rebuilt one, it seems like parts were expensive and hard to find. Also, having an in line 6 with a v drive would position the weight of the engine quite a bit further aft than the hull was designed ...