f150 seized camshaft

[cyrillefrenchy]

hello
on my yamaha 2005 f150, today i had an engine failure, the 2 top camshafts journals seized up in the head, causing a timing belt to break, the camshafts are locked up in the head.
i took the head cover off and the camshafts off as well and i can clearly see the top journals are damaged/ melted .
lack of lubrication i guess, so i took the counterbalancing weights off and i found the green plastic pinion blown apart.
i guess the debris have clogged the oil pump, causing the camshafts to seize in the head.
i am right?
what is your experience about that?
i am going to take the engine all apart to see if the bottom end is damaged.
any good powerhead for sale?
thank you for any help.
frenchy

[rodbolt17]

you really really need to contact a real yamaha dealer.
the balancer was a known issue and should have been replaced.
it sings for 30-50 hours before it fails.
if the cams failed for lack of lube the crank is most likly damaged as well.

[Kirk Gibson]

Sings

Rodbolt,
By "sings" do you mean something that would have to be listened hard for ...or is it really noticeable?
I have a new Seafox 256CC w/twin F150s and I want to know what to be listening for.
Thanks

[cyrillefrenchy]

you really really need to contact a real yamaha dealer.
the balancer was a known issue and should have been replaced.
it sings for 30-50 hours before it fails.
if the cams failed for lack of lube the crank is most likly damaged as well.

thank's for the answer, i will take eveything apart tomorrow and will let you know.
i am ready for big damage even if i don't want it...
the boat is used for rental , so no warranty coverage.

[rodbolt17]

bummer.
Ill check what I have.
by "sings" it will start with a high pitched warbling noise.
almost like a washing machine.
about 08 they had the defect fixed.
ALL F150 motors prior to 08 will most likly suffer a balancer failure.

[JARB]

I have read somewhere, here or another forum, that there is a sound file on the Yamaha intranet of a bad balancer. If this file exists it should be made public so we all know what to listen for. Getting more and more worried about my own 2007 F150 and having this timebomb in the engine doesnt feel good at all..

BTW, Sorry for your loss of the engine..

[cyrillefrenchy]

rodbolt do you know what torx wrench size are the head bolts?i need to buy a socket for that.
i start to take apart this week end, i found a complete good head close to where i leave.
i will let you know how everything goes.
rodbolt again you said: after 80 yamaha fixed the problem? is that mean if i buy a new counterbalencing weight unit now to install on my 05 engine after rebuilt i should be ok?
what is the difference? is it a different green plastic pinion that failed?
thank's for the help.
frenchy

[cyrillefrenchy]

took the engine apart today, the crankshaft is ok,crank and rods bearings are still ok, just marked a little, not blued not blown up, i am lucky.only the crankshafts are seized up in the head.
the oil pick up tube in the mid section is clogged up with the counter balancing weight pinion debris.
found good used parts locally, i am going to pick them up on monday morning and let you know.

[rodbolt17]

make sure you remove and clean the oil pressure control valve as well.

[cyrillefrenchy]

Yes i will,including the oil pump.
Thank you for the advise

[rodbolt17]

then most likly the oil galleys in the head got plugged.
thats why the crank bearings still had lube and the cam did not.
careffully check all block oil gallys.
I really should edit that, but beer says no .
splling

[cyrillefrenchy]

yes i agree with you
finished to take everything apart today, i had to go get a stronger flywheel puller than the one i had, a 55 torx socket for the head bolts and a 12 female torx socket for the rod bolts. 3 trips to the local auto store.thank you autozone...
i confirm, all the crankshaft and rods bearings looks new,some debris in the block and crankshaft oil galleys , but not much at all.
i wonder why these debris did not get stopped by the oil filter and clogged the head galleys?? any idea??

[rodbolt17]

yes, because just like you automobile, its not a full flow filter.
not designed for that much debris.

[cyrillefrenchy]

finally put the engine back together today, i found a good used head , bought all new gaskets, pistons rings,main and rods bearings, oil pump, timing belt and new updated counterbalancing weight.
starter right up first shot.
thank you rodbolt for all the advises, the boat is back in business.
how often this counterbalancing part should be checked? 500 hours?

[200090tlry]

How come im scared on tearing into the motor like that

Ive done everything else on motor. Is getting the motor off pretty easy and working on rods,rings and such.