1998 Mazda protege cylinder head bolts torque you bought haynes manual and it tells to 1215lbs then tighten 45degthen 90deg what need know do turn 45then another?

The Haynes manual is specifying a multi-stage tightening process for your 1998 Mazda Protege's cylinder head bolts. The 1215 lb-ft is the *initial* torque specification. After you've reached that torque using a torque wrench, you then need to further tighten the bolts in *degrees* of rotation using a torque wrench *and* an angle gauge (sometimes called a degree gauge or an angle finder).

Here's what you need to know:

* 1215 lb-ft is a very high torque value for cylinder head bolts. Double-check this figure in your Haynes manual and make absolutely certain it's correct for your specific engine. This is unusually high and likely an error. Most cylinder head bolts are tightened to values in the range of 60-100 lb-ft. If you're sure of this number, consider getting a second opinion from a mechanic or another reputable source before proceeding. Incorrect torque can cause serious engine damage.

* Angle tightening is crucial for even head gasket compression. After the initial torque, the bolts are stretched further to ensure a consistent clamping force across all the bolts and a proper seal. The added 45° and then 90° rotations are not done using the torque wrench to measure the force, but to ensure that all the bolts are stretched the same amount.

* You need an angle gauge or degree gauge. This is a specialized tool that attaches to your torque wrench and allows you to precisely measure the amount of rotation in degrees. You cannot accurately do this step by feel.

* The sequence matters. Your Haynes manual will likely specify a tightening sequence (a pattern for tightening the bolts in a specific order, often in stages). Follow this sequence precisely. Tightening bolts out of order can warp the cylinder head.

* Two-stage angle tightening: After reaching 1215 lb-ft (if it is indeed correct), you then turn each bolt an additional 45 degrees. *Then*, after completing the 45-degree turn for all bolts, you turn each bolt an *additional* 90 degrees, completing the process.

In short: You can't just eyeball or guess the 45° and 90° turns. You absolutely *must* use an angle gauge along with your torque wrench. If you don't have this tool, borrow one, rent one, or take your car to a mechanic to have the cylinder head bolts tightened properly. Improper tightening can lead to a blown head gasket, requiring a very expensive repair. Again, double-check that 1215 lb-ft torque specification; it seems unusually high.