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• Q796568 subject Q8285216.
• Q796568 abstract "The BMW M42 is a straight-4 DOHC piston engine produced from 1989 to 1996. Following BMW's typical construction techniques, the motor incorporates a durable cast-iron block and aluminum head. Weight-saving measures include aluminum chain cases, oil sump, motor mount arms, accessory mounts and a cartridge-style oil filter housing. Closely related to the single cam M40, the DOHC 16 valve head and chain-driven cams provided a notable increase in power. It was used in North American versions of the E36 318i instead of the M40. The M42 also incorporated other performance features such as a forged steel crankshaft and welded tubular stainless steel exhaust manifold instead of the more typical cast-iron items. BMW also fitted hydraulic motor mounts to decrease the inline four's inherent noise, vibration and harshness (NVH) compared to the smoother inline sixes already in production at that time.The M42 went through several minor revisions during production. All versions featured a low-maintenance timing chain with a self-adjusting hydraulic chain tensioner and hydraulic valve tappets. The M42 also incorporated the Bosch Motronic M1.7 DME, eliminating a distributor in favor of fully electronic ignition timing. The DME was configured to fire four individual remotely mounted coils. Furthermore, in markets that required emissions controls, the DME also incorporated an upstream O2 sensor and three-way catalyst.Early models of the M42 were subject to several recalls. The most common recall was due to frequent failures with a profile gasket sealing the lower cam chain case to the underside of the cylinder head. This gasket seals the primary coolant passage within the timing chain case. A significant failure would thus discharge pressurized steam and hot coolant into the timing chain case. In many cases this coolant rapidly contaminates the motor oil in the sump, causing main bearing failure. Most failures were noted with poorly maintained motors, especially where coolant specifications and mixtures were not observed. BMW updated the profile gasket material and instituted a program to repair motors under warranty. In extreme cases, the aluminum mating surfaces in the head and chain case would corrode.The earliest versions of the M42 also developed problems with the cam chain drive. The hydraulic tensioner, chain guides, idler wheel and rear lower chain case have all been updated to resolve problems with mechanical wear. Most of these changes were implemented in the M42's closely related successor, the M44. These parts can all be retrofitted to the M42 to improve durability.When installed in the BMW E30, a two-piece oil pan with a removable front sump was fitted to the M42. This design has two notable problems. The first is a vulnerability to road hazards, as the sump sits fairly low and is not protected by a subframe or cross-member. The aluminum pan will crack instead of deform on significant impacts. Steel skid plates have been developed to resolve this problem and are highly recommended in cases where the front suspension has been modified to improve handling. The second problem is far more significant - the upper oil pan casting incorporates the oil pump's supply passage, and is sealed to the crankcase oil filter housing with a paper gasket. Thermal cycles and engine vibration tend to loosen the six 10mm upper pan mounting bolts inside the motor. Routinely, a loose 10mm bolt or two can be found rattling around high-mileage M42 sumps. If not caught in time, the paper gasket sealing the oil pickup passage can be forced into the crankcase by oil pressure, potentially causing a major loss of oil pressure and/or aeration of the motor oil. Thus it is strongly recommended that any new owner of an early M42 remove the lower pan to inspect these bolts. A permanent solution is to remove & clean the six internal 10mm bolts, apply a thread-locking sealant to the bolts, and re-assemble.In the final versions of the M42, BMW engineered a dual length intake manifold (called "DISA" by BMW)".
• Q796568 displacement "0.001796".
• Q796568 manufacturer Q26678.
• Q796568 predecessor Q796565.
• Q796568 productionEndYear "1989".
• Q796568 productionStartYear "1989".
• Q796568 successor Q796572.
• Q796568 wikiPageExternalLink www.m42club.com.
• Q796568 wikiPageExternalLink 318is.htm.
• Q796568 wikiPageExternalLink m42.html.
• Q796568 wikiPageWikiLink Q1163122.
• Q796568 wikiPageWikiLink Q1381997.
• Q796568 wikiPageWikiLink Q1431426.
• Q796568 wikiPageWikiLink Q1478080.
• Q796568 wikiPageWikiLink Q1784109.
• Q796568 wikiPageWikiLink Q234021.
• Q796568 wikiPageWikiLink Q26678.
• Q796568 wikiPageWikiLink Q2723810.
• Q796568 wikiPageWikiLink Q308881.
• Q796568 wikiPageWikiLink Q361723.
• Q796568 wikiPageWikiLink Q408118.
• Q796568 wikiPageWikiLink Q466511.
• Q796568 wikiPageWikiLink Q608824.
• Q796568 wikiPageWikiLink Q630010.
• Q796568 wikiPageWikiLink Q653807.
• Q796568 wikiPageWikiLink Q720552.
• Q796568 wikiPageWikiLink Q7700688.
• Q796568 wikiPageWikiLink Q779325.
• Q796568 wikiPageWikiLink Q796565.
• Q796568 wikiPageWikiLink Q796567.
• Q796568 wikiPageWikiLink Q796572.
• Q796568 wikiPageWikiLink Q828137.
• Q796568 wikiPageWikiLink Q8285216.
• Q796568 wikiPageWikiLink Q838837.
• Q796568 displacement "1796.0".
• Q796568 manufacturer Q26678.
• Q796568 name "BMW M42".
• Q796568 predecessor Q796565.
• Q796568 production "1989".
• Q796568 successor Q796572.
• Q796568 type AutomobileEngine.
• Q796568 type Device.
• Q796568 type Engine.
• Q796568 type Thing.
• Q796568 comment "The BMW M42 is a straight-4 DOHC piston engine produced from 1989 to 1996. Following BMW's typical construction techniques, the motor incorporates a durable cast-iron block and aluminum head. Weight-saving measures include aluminum chain cases, oil sump, motor mount arms, accessory mounts and a cartridge-style oil filter housing. Closely related to the single cam M40, the DOHC 16 valve head and chain-driven cams provided a notable increase in power.".
• Q796568 label "BMW M42".
• Q796568 name "BMW M42".