Front cover oil leak, specialty tools needed? qsx15

[GOT12]

Hello

new here have searched several times for the front cover leak, if it has already been covered please post a link

I purchased a 2007 steiger stx 480hd at auction. i believe qsx15 front cover is identical to isx15

the engine had a couple of front engine oil leaks and check engine lights were coming on.

the biggest leak was the filler tube. i called cummins splains to hook up their computer and run the overhead.

the only fault showing was the engine brake cummins disabled that. however the mechanic started removing everything to do the overhead, drained the antifreeze. when the mechanic discovered a bolt from the cac tube had "nearly" worn through the front cover he called and said he wouldnt go any further as the front cover needs replaced.

Cummins said to replace the front cover the tractor must be hauled to their shop and the only estimate they could give me was that it would be over $5,000

mechanic said the engine sounds good but that it has some blowby, he said that is not uncommon for a tractor with nearly 5000hrs and that he discovered a little bit of dust in the air intake tube. i cant see spending possibly $7,000 on this only to have to have a complete rebuild done in a few years.

i paid cummins $1,550 to remove & reinstall parts on top of the motor drain & refill radiator and shut off engine brakes 3.5 hours time.

at that rate i am afraid to put it in their shop.

cummins mechanic said the qsx/isx will develop front cover oil leaks from the owner not keeping the engine washed. he said dirt builds up between the block and front cover, over time this dirt vibrates down warping the front cover. a new cover and keeping the engine clean is the only fix.

my brother is a mechanic and i might have him do the job, cummins mechanic said this job takes over 2k in specialty tools and a mechanic trained to work on a isx

will purchase a shop manual from cummins

questions

1. is there a possible fix for the oil leak without removing the front cover? silicone?

2. what specialty tools are required to remove and replace the front cover?

3. pull complete cams or remove replace gears?