The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 10, 1999
Filed:
Jul. 14, 1997
Keiichi Yuo, Kanagawa-ken, JP;
Masahiko Watanabe, Kanagawa-ken, JP;
Nissan Motor Co., Ltd., Kanagawa-ken, JP;
Abstract
A method of fastening an intake manifold to cylinder heads of an internal combustion engine having two cylinder banks in order to reduce the deformations of cylinder bores in the cylinder heads. The method includes steps of (1) temporarily fastening the cylinder heads to the cylinder block using cylinder head bolts with a fastening torque of 1.0 kgfm (9.8 Nm), (2) temporarily fastening the intake manifold to the cylinder heads using intake-manifold bolts with a fastening torque of 1.6.+-.0.1 kgfm (15.7.+-.0.98 Nm), (3) loosening the fastening torque of the int-manif. bolts up to 0 kgfm (0 Nm; see h of FIG. 3), (4) fixing the cylinder heads to the cylinder block using the cylinder head bolts with a fastening torque of e.g. 3.0 kgfm+60.degree. (29.4 Nm+60.degree.) and (5) fixing the intake manifold to the cylinder heads using the intake-manifold bolts with a fastening torque of 0.9.+-.0.1 kgfm (8.8.+-.0.98 Nm).