Merc in line 6 detective help needed

[Tom Smyth]

Got several inline 6 blocks that I need-to identify. they are listed below with all the particulars that I can find on them:


Block #1 casting number 852-6450 distributor block, Not power ported No serial number

Block #2 - casting number 852-5591 - Not power ported, Serial number 4314369 - also a distributor motor

Block #3 -Casting number 852-7738- NON Power ported block- ADI ignition - A995294 stamped in the freeze plug on intake side of the block

Block #4 - Casting number 852-7738 - Power ported block - serial number 6527975 - distributor motor

Block #5 - casting number 852-7738 - Power ported block - Distributor motor - no other numbers

I got an idea on a few of these but would appreciate others to offer their opinion on them.

thanks very much

[1954bmw]

OK, what did you decide on the 852-7738 blocks, I have a blue stripe, long shaft 150 horse with a 852-7738 block, no serial number distributor ignition. The only number where the serial number goes is a stamped 7704, how did you end up with a 852-7738 block that wasn't power ported???? Also, what do you consider the mosquito coast, have family in Jacksonville, do you give tours???

[W2F a V-King]

I have a #2 on your list. I am in restore mode now, serial number on mid is 4126422. It's a 1975 150 J Block Short shaft with no serial number stamped on the block. Must have been a warranty replacement, but it does have the J stamped on it under the casting number.. Blue Stripe motor with louvered cowl, etc...

Have not dis assemble the block yet, but all else is apart. .082 Main Jets in 1-2-3.

Distributor Ignition...just in case anyone is looking, I found a source for Distributor bearings Dirt Cheap. Don't have it in front of me right now. Less than 12$ for a set...actually have a spare set as I bought 2 of each they were so cheap and figured someone may need a set.

Not sure exactly what your looking for information wise though....?

HTH some...

[1954bmw]

I have a 852-7738 engine and no serial number, have looked all over that thing for a serial number, any way, I was wondering if Tom Smyth made any decisions on the 852-7738 blocks. Also was wondering if he offered tours of his collection, will be down in Jacksonville for Daytona Bike Week visiting family??? Just ordered a starter off ebay to check compression on this 150

[baldad45]

The casting numbers can be the same for 90,115, 1500 or XS . Same block just different port milling .

[1954bmw]

OK, that does make sense, thanks for the response. Mark

[Mark75H]

4314369 is a '75 115. '75 150's don't start until 4319880; '75 115's start with 4310785. Agrees with not being power ported.

[Mark75H]

#4 would be an '84 115, power ported and 150 style porting with the net hp rating

[W2F a V-King]

4314369 is a '75 115. '75 150's don't start until 4319880; '75 115's start with 4310785. Agrees with not being power ported.

Should that read "1976" 150's start at 4319880? Or did I read it wrong?

General Information:

• This model was painted all "Phantom Black."
• The serial number was on a plate riveted to the swivel bracket above and between the clamp screws.
• Serial numbers 3752620 thru 4121434 were 1974 models.
• Serial numbers 4121435 thru 4319879 were 1975 models.
• Serial numbers 4319880 thru 4602011 were 1976 models.
• Merc 1500EL (Long Shaft, Electric Starting with Alternator) models were produced and Merc 1500 ELPT (Long Shaft, Electric Starting with factory installed Power Trim) were also produced in these years.
• Merc 1500E (Short Shaft, Electric Starting with Alternator) models were produced in 1974 & 1975.

http://store.oldmercs.com/category_s/881.htm

[Mark75H]

Correct! I mistyped 75 instead of 76!

[Tom Smyth]

Totally forgot about this thread. Got these blocks in a deal and was trying to determine what they were if possible.

[1954bmw]

OK, so Mr. Smyth, where is mosquitoville and do you give tours of your shop, going to be in Jacksonville the end of Bike Week and looking for something to do after lunch with the family??? Mark

[Tom Smyth]

Sorry I don't do tours. To much of a mess here. Mosquito ville? we still got em in the middle of February.

[1954bmw]

OK, still have the 852-7738 block and no other numbers I could find, anyway, can you see the power port on the piston if you take the intake side covers off??? And is the intake side the starter side, NOT the distributor side??? Thanks, mark

[Tom Smyth]

All the in line 6 motors have the starter on the intake side. Not sure what you are asking....