I think i need a little help? Blown head gasket (1 Viewer)

Joined
Apr 20, 2019
Messages
57
Location
Oregon
Engines aren’t quite as mysterious as some would make it out to be. Something is stoppoing the cam from turning. What year engine are we talking about? I understand that the variable valve timing engine are interference engines. If you (carefully) move the cranshaft a bit does the cam free up?
1999 4.7
 

suprarx7nut

The YotaMD Guy
Supporting Vendor
Joined
Sep 28, 2010
Messages
3,177
Location
Colorado
 
 
Engines aren’t quite as mysterious as some would make it out to be. Something is stoppoing the cam from turning. What year engine are we talking about? I understand that the variable valve timing engine are interference engines. If you (carefully) move the cranshaft a bit does the cam free up?
Agreed to an extent. As i often tell people, it's just nuts and bolts. And the 2UZ is pretty resilient and low stress so a torque value being off here and there isn't going to grenade it in a day. That being said... there's an awful lot of parts and wires and clips and bearings and seals and gaskets and mating surface prep required to put it together and keep it running for more than a month. Without the FSM, what are the chances of correctly placing the timing belt all all three pulleys? Low, I think.
 

lowenbrau

SILVER Star
Joined
Jan 22, 2003
Messages
3,851
Location
Rockyview County AB
 
 
 
Agreed to an extent. As i often tell people, it's just nuts and bolts. And the 2UZ is pretty resilient and low stress so a torque value being off here and there isn't going to grenade it in a day. That being said... there's an awful lot of parts and wires and clips and bearings and seals and gaskets and mating surface prep required to put it together and keep it running for more than a month. Without the FSM, what are the chances of correctly placing the timing belt all all three pulleys? Low, I think.
Shrug. I managed without a manual but my new belt had marks on it so it was kinda paint-by-number. As far as torque numbers go, "Pretty tight" is pretty good. The 2UZ in our Sequoia has about 435,000 km on it now. I wouldn't be so brave with something of value.
 
Joined
Apr 20, 2019
Messages
57
Location
Oregon
Shrug. I managed without a manual but my new belt had marks on it so it was kinda paint-by-number. As far as torque numbers go, "Pretty tight" is pretty good. The 2UZ in our Sequoia has about 435,000 km on it now. I wouldn't be so brave with something of value.
Even if I end up having to do a engine swap I will be money ahead LC super clean
 
Joined
Aug 5, 2005
Messages
459
Location
Ontario, Canada
 
 
 
A warped head torqued to a flat block will bind the cam shaft. Also improper torque sequence and/or torque specs can warp the head and bind the cam.

Did you verify that the block and head were flat before putting everything back together?
 
Joined
Apr 20, 2019
Messages
57
Location
Oregon
A warped head torqued to a flat block will bind the cam shaft. Also improper torque sequence and/or torque specs can warp the head and bind the cam.

Did you verify that the block and head were flat before putting everything back together?
Yes I put a straight edge on it and it looked good I’m trying to find one as we speak I will look at this again when I take it back off
Thanks
 

suprarx7nut

The YotaMD Guy
Supporting Vendor
Joined
Sep 28, 2010
Messages
3,177
Location
Colorado
 
 
Yes I put a straight edge on it and it looked good I’m trying to find one as we speak I will look at this again when I take it back off
Thanks
Your willingness to just dive in is impressive. Many people freak out about having to DIY an alternator and here you are with a straight edge, no FSM and taking cylinder heads on and off on a whim. Haha.

Kudos.
 
Joined
Apr 20, 2019
Messages
57
Location
Oregon
A warped head torqued to a flat block will bind the cam shaft. Also improper torque sequence and/or torque specs can warp the head and bind the cam.

Did you verify that the block and head were flat before putting everything back together?
I didn’t check the the block
 

MongooseGA

Learns things the hard way
SILVER Star
Joined
Jul 9, 2017
Messages
2,675
Location
Atlanta GA
Damn. That's like the single biggest job to do in almost any engine. Definitely not a project I'd want to take on, let alone sort of blind.

OP, you've got huge balls. Or a small wallet. Maybe both. Definitely the balls, though.
 

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

Top Bottom