TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download

TM 9-2815-220-34 Tab/,, S·. Cu1tlll'l'li110 o, Cra1k+1ia ad Associalecl Part� Ucµafr Stamfon/s - Co11li1111ed . F'ig. Ref. Point of Sn.cs and ts Wear Com11 onenl No. l etter me asu remcnt of new parts lim i ts 3· 174 h 1 nsid wid 1 h of .:onncI in rod j oual or �rank �hnfl 3.11170 3.1510 3.1520 Conn�<'tlll r.111. 3-183 l' I !+ ncs• of bear mg at c.:nter lhJnng�. anll SID 0. 170 3 0.1708 0. 1698 bolts 0.003 unJr�iu 0.1713 0 .1718 0.1708 0.010 undersi'Zc 0. 1 748 0.1753 0.1743 3-183 x rt 11ckncss or bearing) al ends (lo be 0.0003 lo 0.0006 lc's l han "c "J 3-183 ua Inside diameter of bearing at proper torque tightness .- STD 3.7546 3.7 568 3.7573R 0.003 undersize 3.7516 3.7538 3.7543Rc 0.0 I 0 undcrsizc 3.7446 3.7'168 3.7-l73Rc 3·174 y 011 clearance between bearing and journal 0.00-llL 0. 0073L 0.0088L 3-183 7 3·183 y Outside width of connecting rod 1.56 70 1.5690 • Conn.:cting rod. 3-174 h Side clearance of (two) rods on crankshaft journal 0 0090L 0.0 l 70L 0.0200 L bearings. a1.d 3·183 Allowable twist of connecting rods 0.0005 per in of b�aring lcnllth. bolls (NO strnigh tening rmillcd) 3·183 a -In�idc diameter of connecting rod (crankshaft end) at proper 4.0941 4.0946 • torque tightness 3-183 e - Inside di3tneter of connecting rod (piston pin end) 2.2495 2.2505 . 3-183 b - lm1de d1ameh:r of bolt hole in connecting rod nnd cap 0.6248 0.6253 • 3-183 d Outside diametet of connrcting rod boll 0.6244 0.6246 . 3·! 83 b·d Ft1 of boll in rod Md cap 0.0002L 0.0009L • 3-183 v Outside diametr of split sleeve beang must be press fii in bore. llurnish to at sleeve bearing prior to finish diameter 3-183 w - Inside diameter of bushing-type sleeve bearing 2.1275 2.1277 2.1280 3-183 f Ouuidc diameter of piston pin 3-183 W·f Fit of pin in be�nng Refer to paragraph 3·37c for explanation of symbols. 3-57. Repair a. Cran ksllafts. (I) Replace crankshafts that arc deeply scratched, nicked, burred, scuffed or galled. Minor imperfections in lhe jouals may be repaired by polislting wHh a crocus cloth dipped in clry-clean- D ing solvent (P-0-680, Type JI). f (2) Replace dowel pins (19, fig. 3-174) and straight pins (25) in crankshaft nange if pins do not fit securely in nangc, or are out-of-round. Replace dowel pins which are not within limils specified in the repair standards (table 3-8). NOTE The headless grooved dowel pins in the flywheel end flanges are available in 0.005 and 0.010 in. oversize. Ream crankshaft flywheel mounting flange to necessary oversize dimensions and install new pins. Whenever oversize pins are used, it will be nec essary to ream the rtywheel and tt·ansmission drive gearshaft accordingly. (3) Replace a cracked crankshaft or a crankshaft showing evidence of wear due to bent or twisted connecting rods. 2.12 50 2.1252 0.0023L 0.0 02 7L b. Connecti11g Rods an elt»'ings. (1) Connecting rod bolts. 2.1248 0.0042L (a) Replace bolts that do not fit snugly in rod and cap. (b} Replace bolts that have damaged threads, galled pilot diameters, or diameters that ·are not within limits specified in repair standards (table 3-8). (c) Replace bolts that are cracked, scl'atche<l or show any evidence of stretching. (2) Connecting rod bea1·ings. Replace all bear- ings that do not check within limits specified in repair standards (table 3-8) or when bearings do not show 75 percent contact by Prussian blue transfer after bore check. (3) Connecting rod assembly. Discard connect- ing rods that are bent 01· distorted. Straightening of connecting rods is not pe1·1nitted. Replace con- necting rod assemblies which are not within limits specified in repair standards (table 3-8). Replace worn or damaged connecting rod· bushing-type bearings using improvised tool (fig. 3-1"/4.l). Bur- nish to seat bearing, then finish ream to 2.1275 to 2.1277 inches. Connecting rod bore center dimen- sion (fig. 3-176) must be maintained. Change 3 3·87 f f