Need help with my 3.7l mcm 180

[nola mike]

Whay should i also do if its the outdrive wich is sezed srry if these are basic question this my first time with engines

Replace/repair the outdrive. I suppose that with the questions you're asking, you should probably tell us why you think it's seized and what you have done to come to that conclusion

 

[Bondo]

Whay should i also do if its the outdrive wich is sezed srry if these are basic question this my first time with engines

Ayuh,.... The drive is splined to the motor, if the drive is seized, the motor won't turn over,....

 

[Scott Danforth]

if your outdrive is siezed, your motor wont ever turn over as the outdrive is splined to the engine (all the shifting of an alpha drive is done in the foot with dog clutches)

step one, pull the drive.

regarding the water pump. no way that the cam driven impeller can hold the motor back, even if you filled the cavity with marbles and locked it up tight, the cam snout would snap off from the torque of the starter

most likely either the drive was toast when they parked it and it rusted more, or the head gasket went when they parked it and now the cylinders are toast.

back to step 1. drive has to come off
then try motor
if motor doesnt spin, then on to step 2 - pulling the motor

 

[The Begginer]

Replace/repair the outdrive. I suppose that with the questions you're asking, you should probably tell us why you think it's seized and what you have done to come to that conclusion

To be honest i havent done any thing just pulled out the seats and tried to turn the engine directly but it didnt turn so i assumed it was seized so can you please tell me step by step what to do to test if its seized thanks

 

[Scott Danforth]

step 1 pull the out drive (information and videos in the stickies in the mercruiser section)

step 2, try the motor, if it is not seized, then work on the typical 470 issues and fix the out drive. if the motor is seized, find another because if it sat for any length of time, it will require a large pile of cash to rebuild

 

[The Begginer]

step 1 pull the out drive (information and videos in the stickies in the mercruiser section)

step 2, try the motor, if it is not seized, then work on the typical 470 issues and fix the out drive. if the motor is seized, find another because if it sat for any length of time, it will require a large pile of cash to rebuild

What are the ussual 470 issues ?? And if its seized what engine should i pick ???

 

[Eric 3.7LX Alpha 1]

What are the ussual 470 issues ?? And if its seized what engine should i pick ???

There are a couple: coolant leaking from the weep hole:

1986 Mercruiser 470 coolant leak through weep hole

My brother in law is in the market for a boat, and has run across a 23 foot boat with the infamous Mercruiser 170. The gentleman on the phone told him that it seemed to leaking antifreeze at the bottom of the weep hole. He also told my brother in law that there's about a foot of clearance in...

forums.iboats.com

1987 mercruiser 470-170hp water pump replace ? maybe 1986 eng in 87 boat

New to 470's have had a few inline 4cyls before but not like this !!! bought it real cheap -- last owner said water pump was leaking thru weep hole ? but from what i am finding there is no weep hole ? correct me if i am wrong . can impeller be replaced ? or does cam have to be pulled ? once...

forums.iboats.com

and this read up:

Mercruiser 470 Coolant Leak

These engines don't like to get hot. With the block being made of aluminum and the cast iron head, with different expansion rates, it almost always results in a blown head gasket. With everything working as it should, my engine runs at 160° all day long. Have a good temp gauge on the helm.

also the charging system is expensive to replace if it fails. The factory set up is a stator that produces current which is located under what looks like the harmonic balancer. There is also a voltage regulator that is water cooled near the heat exchanger. The VR is prone to failure and usually causes high voltage readings when failed. The best fix is to replace it with a belt driven alternator, there are aftermarket kits available, none by Mercruiser.

 

[The Begginer]

I acctually have a belt driven alternator already

 

[Scott Danforth]

What are the ussual 470 issues ?? And if its seized what engine should i pick ???

to expand on above

the 470 has an iron head and aluminum block. the block has an open deck (floating bores) because it was cheaper for mercruiser to build and they didnt spring for the aluminum head. so as much as a 10 degree overheat and the block moves enough to blow the head gasket. the fix for this is a bore spider welded in the block to stabilize the deck and an aftermarket edelbrock aluminum head

the inherent issues with the ford head, valve train and non-adjustable rockers requiring different push rods for any head work, GM style block/cam, GM style timing, GM flywheel and custom mercruiser crank......

the heat exchangers that were originally paired with the engine were too small. this lead to large amounts of overheated engines and blown head gaskets. eventually mercruiser installed a larger heat exchanger

the water pump is driven off the cam snout. the cam snouts were never hardened as that would have cost money. so the seals wear thru the cam snout material. the fix is a speedi sleeve.

the stock charging system was pulled over from the outboard lines to be cheap. the charge output was modest as it was only intended to charge the battery and run lights. not enough output to run radios and other electronics. however the regulator is the week link. since that is no longer being made in high volume, that little water-cooled beauty is about $500. hence the aftermarket external alternator conversion

most of the parts for the 470 are NLA

as to replace it. I would find a complete and running 4.3, preferably with an alpha 1 gen 2 and swap the motors pulley to prop

 

[The Begginer]

Wanna ask about wher you guys find used marine engines with internationak shipping, thanks

 

[The Begginer]

Hey guys found out my engine was seized so i disassembled it and brought it to the machine shop and they said it was possible for a rebuild so i was looking for places to buy parts and stumbled upon ebasicpower is that a giid website ???

 

[Scott Danforth]

ebasic sells GLM parts. the joking response is Good Luck Marine. most are chinese import parts.

to properly rebuild the mercruser 470, you are looking at sleeving the block, line boring, head work, etc.

get a complete estimate before you start. you may be surprised as to what it will cost you.

 

[matt167]

For a couple bucks you can buy a cheap rebuild kit for a 460 and then buy the gaskets and marine specific parts you need for that mutt of an engine. but machine work will be horrible.. I deal enough in Honda and Subaru to know that open deck engines suck...

I would never bother rebuilding one for a boat IMO... But I've thought about offset grinding the crank for BBC rods,, pistons aluminum head and dumping it into a street rod. It would be just a little over 4.0L, with enough torque to burn tires for days, but it would only be a novelty

 

[Eric 3.7LX Alpha 1]

I haven't bought anything from them for a good 8 years, but I never had a bad experience with them. They did have a good selection of 470/3.7 parts available back then.

 

[The Begginer]

Hey guys found out it acctually wasnt seized i acctualy just didnt turn it hard enough cus i was scared i would break the bolt but acctually instead it was acctually the sterndrive , so can somone tell me step by step on how to rebuild the stern thanks

 

[Scott Danforth]

Hey guys found out it acctually wasnt seized i acctualy just didnt turn it hard enough cus i was scared i would break the bolt but acctually instead it was acctually the sterndrive , so can somone tell me step by step on how to rebuild the stern thanks

never turn the motor by the crank bolt. always turn the motor by the flywheel or by using a crank socket.

 

[The Begginer]

Is it okay to put bolts on the holes on the cover thing of the bolt and wedge a bar on it ???

 

[The Begginer]

Replace/repair the outdrive. I suppose that with the questions you're asking, you should probably tell us why you think it's seized and what you have done to come to that conclusion

How can i repair it ??

 

[Eric 3.7LX Alpha 1]

How can i repair it ??

Are you sure the drive is seized? What made you decide it is the case? Your first post on here was my engine is seized. So I am guessing, you tried to start the engine and it wouldn't turn over? Just clicked and the starter did not actually crank/or turned the engine over? A drive wouldn't seize from sitting. It's sealed from the outside and should be able to sit for years with gear lube in it without issues... so unless water got it and split the drive housing somehow, I can't see how it would be seized unless it was parked that way.

If you pulled the engine out, then you pulled the drive off.

Can you turn the shaft on the top half of the drive with the u joints attached by hand?
Can you rotate the propeller by hand with the drive off the boat?

 

[The Begginer]

Are you sure the drive is seized? What made you decide it is the case? Your first post on here was my engine is seized. So I am guessing, you tried to start the engine and it wouldn't turn over? Just clicked and the starter did not actually crank/or turned the engine over? A drive wouldn't seize from sitting. It's sealed from the outside and should be able to sit for years with gear lube in it without issues... so unless water got it and split the drive housing somehow, I can't see how it would be seized unless it was parked that way.

If you pulled the engine out, then you pulled the drive off.

Can you turn the shaft on the top half of the drive with the u joints attached by hand?
Can you rotate the propeller by hand with the drive off the boat?

I knew the drive was seized because when i pulled it out and put it on drive i couldnt turn it