Attachment device for air cleaner case in engines

An air cleaner case is installed by an attachment device on the back of an intake manifold having a plurality of branch tubes extending forwardly toward the intake ports, respectively, of an engine cylinder head. The attachment device includes upper and lower attachment arms on the air cleaner case extending substantially horizontally and upper and lower seats on the intake manifold. The upper and lower attachment arms are substantially vertically detachably coupled to the upper and lower seats, respectively. The lower attachment arms are coupled to the lower seats by vertical pins mounted on the lower seats and the upper attachment arms are coupled to the upper seats by vertical bolts. The air cleaner case can easily be attached and detached vertically even in the limited space surrounding the air cleaner case behind the intake manifold. The bolts on the upper attachment arms and seats can easily be tightened and loosened vertically to facilitate attachment and detachment of the air cleaner case for easy maintenance or servicing thereof.