‘89 150 v6 rebuild kit

[racerone]

Those bearings are split / fractured when made.----Simply remove the ring and it falls off the crank !

 

[flyingscott]

I would look at buying the overhaul kit now. It comes with all new bearings ,new rod bolts and the gasket kit. Not to mention all new pistons.

 

[Zep25]

I was going to replace the bottom crank bearing just to be safe (tiny bit of rust)... but the middle bearings seem to be ok. They are slightly discolored, but seem to be smooth and turn well. Judging by the pics, would you replace them anyway??

 

[Zep25]

Update. Finally got the block honed and bored. Replaced all 6 pistons .02 over. Reinstalling the crankshaft and attaching rods. Crank is in, middle bearing dowels are locked in. 1,2,3,5 pistons in and crank turns freely. As soon as I put in #6 the crank won’t turn past #6 piston bottom dead center, I get a hard stop. Feels like somethings catching or blocked/locked?! Same thing if I install #4?? End cap seems aligned and well seated. I tried tapping on both ends of the crank, shifting slightly up and down to see if it frees the crank, but no luck. Any ideas??

 

[racerone]

Start over.----Put #4 and 6 into the cylinders without rings.-----See if piston will go all the way to the bottom.-----Sounds like you need to check all of them.-----Check that piston has clearance at the skirt when all the way in !

 

[Zep25]

Pulled all the pistons. Took off rings on #6 and reinstalled. Still catches at BDC?! Full stop - like the piston skirt doesn’t have enough clearance in the bottom of the cylinder somehow?? New piston and it looks like the cylinder was bored slightly deeper than before. How could the skirt be binding??

 

[racerone]

Hurry-----Run to the folks that did this ---" bore and hone " ---For you.

 

[Faztbullet]

Machinist didn't bore past sleeve...

 

[Zep25]

Update. You guys were right... twice the machinist didnt bore the full length of the sleeve! Got it worked out. Needless to say, I won’t be back.
Anyway, got the main block back together. New pistons (.02 over and rings, upper and lower bearings, crank back in and sealed with gel seal 2. Crank turning smoothly . Now re-attaching external/ancillary parts. Finally making some progress.

Now a few questions moving forward....

1. Any tips/tricks/pitfalls to be aware of at this point.

2. Thoughts on upsizing jets in the carbs? Is that necessary? What size would be correct? 150sltcem

3. I assume a link and sync and timing need checked before any running above idle revs?

4. Oil pump disconnected. Double oil mix in fuel for the first few tanks??

thanks

 

[racerone]

A little late but did the rebuild kit include some check valves.----They are found in the block at the 2 split main bearings.----Expensive little items.

 

[jimmbo]

When you got the block back, you did wash the bores and crankcase very thoroughly, before putting it together with lots of TCW-3 Oil?

 

[Zep25]

Yes. Cleaned and blown out with compressed air. Then lots of oil on everything when re-installing.
One of the brass check valves was bad. Got a pack of three and just replaced them all.

 

[racerone]

The ones I speak of are at the split main bearings !------Total of 2 check valves there , one at each bearing..

 

[Zep25]

Racerone, Found the check valves you are referring to on the parts diagram. I did not replace those. Strange the omc service manual said nothing about them? What is their purpose? Is there a way to check these without pulling the block apart again?

 

[racerone]

Everybody works to a different standard.----There is a pocket at the bottom of the cylinders that lead to those check valves.-----How do you know that those were not full of cast iron chips from the boring / honing.??-----Did you confirm that those were clean ?-------Your decision.---Big time gap between October and yesterday.------Lot of work done .--Sorry to inform you off these little details after the fact.

 

[Zep25]

Are they in the crankcase head piece or the main block?
Main block was hot dipped and cleaned by the shop (twice! don’t get me stared ) after both borings. Would that have cleaned them?

 

[racerone]

They are in the main block.-----Perhaps ask the supplier of the rebuild kit about omitting these pieces in a " complete kit "

 

[Zep25]

If these valves are blocked, what problems can that lead to? I assume a lubrication problem specifically at the 2 middle crank bearings? Are they one way valves?

 

[Zep25]

Ok. Any thoughts on these other questions....


2. Upsizing jets in the carbs? Is that necessary? What size would be correct? 150sltcem

3. I assume a link and sync and timing need checked before any running above idle revs?

4. Oil pump disconnected. Double oil mix in fuel for the first few tanks??

thanks as always!

 

[Guest]

www.maxrules.com

This is an OMC Tech run site, he sells complete rebuild kits for your motor, any kinda pistons you want too.

You can also check out www.screamand fly.com, those guys are hi-Performance, but will also help you ocate what you need.