DCOE Classic style linkage
Volvo P1800,140
24.11.2021Suitable for 38-55mm DCOE/SPTwin Carburettor Sets LP2500For top mounting only
GENERAL NOTES ON INSTALLATION
a. It is preferable where possible to fit the throttle levers supplied to the carburettors before installation, and ensure that the throttles open and close freely prior to connecting the throttle linkage.
c. Lubricate the linkage with light oil during assembly.
N.B. It may be necessary in certain installations to remove the cast section of manifold between cylinders 2&3 to allow clearance for the new levers (1 & 2).
d. Fit the new Throttle Levers (1 & 2) supplied, to the inside facing ends of the two carburettor throttle spindles. Lever (1) fit the throttle spindle on the fuel union side of the carburettor.
e. Fit the Shim Washers (3) as required behind the Throttle Levers (1 & 2). Extra Shim Washers (3) are provided to ensure a small amount of clearance exists between the Throttle Levers and the carburettor body. The same applies with regards to the original plain washers on the opposite ends of the throttle spindles if they have been disturbed.
f. When securing the Throttle Levers (1 & 2) use the new Tab Washers (4) provided.
IMPORTANT: When tightening the throttle shaft nut the throttle lever should be held to avoid twisting of the throttle shaft.
LINKAGE ASSEMBLY INSTALLATIONS
g. Remove the two centre top cover screws from the left hand carburettor. Fit theActuating Linkage Bracket (5A) and secure using the 2 x M5 Screws (6) and 2 x5mm Spring Washers (7), see Fig. 1.
h. Fit the Adjustable Eyelet (8) with the M8 Nut (9), Plain Washer (10) and Lock Washer(11) to the Actuating Quadrant (5B), see Fig 2.
i. Connect the Actuating Quadrant (5B) to the Linkage Bracket (5A) with the 35mmPivot Pin (12) and secure using 2x R-Clips (13) and Plain Washers (14), see Fig. 3.
j. Connect the Linkage Rod (15) between the Adjustable Eyelet (8) of the ActuatingQuadrant (5B) and the Male Throttle Lever (1).
k. Insert the 27mm Spring Anchor Pin (16) to the Linkage Bracket (5A), then place the2 x Throttle Return Springs (17) onto the Pin (16) and secure with the remaining 2x R-Clips (13), see Fig.4
l. Insert the 48mm Threaded Pin (18) into the Actuating Quadrant (5B). Place2 x Plain 6mm Washers (19) onto the Pin (18) before attaching the2 x Throttle Return Springs (17), see Fig. 4
m. Remove the two centre top cover screws from the right hand carburettor. Fit the CableAnchor Bracket (5C) and secure using the remaining 2 x M5 Screws (6) and 2 x 5mmSpring Washers (7). Fit the 2 x Cable Adjusters (20) into the Cable Anchor Bracket(5C) to approximately 2/3rd of the thread length, see Fig. 5.
ACCELERATOR CABLE CONNECTION
n. Fit the Accelerator Cable Connector Block (21) provided to the accelerator pedal at aposition to be able to achieve an accelerator cable operating movement (pull) ofbetween 30mm and 40mm.
o. The Accelerator Cables (22) must now be secured in a suitable position to aligncorrectly with the Connector Block (21). This can often be achieved by drilling two6.5mm dia. anchorage holes 20mm apart in the engine compartment bulkhead. Fit theremaining 2 x Cable Adjusters (20) to form the anchorage for the accelerator cables,secure the Cable Adjusters (20) using the 4 x M6 Nuts (23) and 4 x 6mm SupportWashers (24) provided.
N.B. It is important to ensure that the cable alignment is correct throughout the fullmovement of the throttle pedal, and does not allow the accelerator inner cables tomisalign with the Cable Adjusters. Failure to do so will result in poor throttleoperation and wear to the accelerator inner cable which will ultimately cause abreakage.
p. Fit the Accelerator Cables (22) by first removing the inner cable from the outer cable.Route the Accelerator Outer Cable between the Throttle Linkage Anchor Bracket(5C) and the Cable Adjusters (20) (at the Throttle pedal end).Where necessary cut the accelerator outer cable to achieve the best cable routebetween the anchorage points, support and secure the cable as necessary using theNylon Ties (25) provided.
N.B. It is very important to avoid tight bends, moving components and heatsources.
q. The inner cables can now be threaded through the throttle pedal Connector Block (21) - see Fig 6. Pass the inner cable through the accelerator outer cable anchorage CableAdjusters (20). When the inner throttle cable is fully inserted the barrel ends of theinner cable will abut the Connector Block (21). Lightly secure the inner cable to theConnector Block using a 2.5mm Allen Key, do not over tighten. The inner cable shouldnow exit the outer cable at the Cable Anchor Bracket (5C).
r. The accelerator inner cables can now be threaded through the hole in the ThreadedPin (18) of the Actuating Quadrant (5B), having first placed 2 x M6 Nuts (23) followedby 2 x Plain 6mm Washers (19) onto the Pin (18). Next place the remaining 2 x Plain6mm Washers (19) followed by the remaining 2 x M6 Nuts (23) onto the Pin (18). Withthe accelerator inner cable between the plain washers and the M6 Nuts (23) ensure theinner cable remains central in relation to the hole in the Pin (18) but do not tighten untiloperation t. in the ACCELERATOR CABLE / LINKAGE ADJUSTMENT.
ACCELERATOR CABLE / LINKAGE ADJUSTMENT
s. First determine the required height of the throttle pedal at the throttle closed position.
N.B. This will be predetermined if the throttle pedal has a return spring and the stop may ormay not be adjustable.
t. With the throttle pedal in the throttle closed position clamp the accelerator inner cable inthe linkage Pin (18). If the throttle pedal has a return spring, allow a small amount offree play in the accelerator inner cable.
u. The throttle linkage can now be adjusted achieve full throttle by adjusting theAdjustable Eyelet (8) of the Actuating Quadrant (5B).Important: In the full throttle position the throttle pedal should contact either anadjustable pedal stop or the bulkhead. This will prevent excessive pedal force fromdamaging the Carburettor, Throttle Linkage or the Accelerator Inner cables.
v. Finally make any fine adjustments to the Cable Adjusters (20) in association with theAdjustable Eyelet (8) with regards to full throttle and ensure a small amount of freeplay exists in the accelerator inner cable where the throttle pedal has a return springwith a top stop.
NOTE: IT IS THE RESPONSIBILITY OF THE INSTALLER TO ENSURE THAT THISLINKAGE IS ADJUSTED AND FUNCTIONS CORRECTLY, AND THAT THEADJUSTABLE EYELET (8) OF THE ACTUATING QUADRANT (5B) CANNOT BECOMEIN-LINE WITH THE LINK ROD (15) AT FULL THROTTLE AS THIS COULD CAUSE THETHROTTLE TO JAM WIDE OPEN.
- All notes serve only as an example and do not replace the workshop instructions of the automobile manufacturers! All information is supplied without guarantee!
Additional information...
- 1076945: Mounting kit, Carburettor Weber 45 DCOE